Interactive Lessons for Every Class and Subject
Short, visual lessons, a definition, the parts that matter, the detail, then a summary. Built for Classes 1-10 and Cambridge O Level.
Biology 20
Biological Molecules & Enzymes
The food tests, the structure of the main molecules, and enzyme action with the two graphs, the most reliably examined practical content in the subject.
FreeCells & Organisation
Cell structure, the plant/animal differences, specialised cells and magnification, the foundation the whole syllabus is built on, and an easy source of full marks.
Coordination & Homeostasis
Nerves and hormones, the reflex arc, temperature and glucose control, and plant tropisms, the topic that is really one idea, negative feedback, applied five times.
Human Nutrition & Transport
Diet, digestion and absorption, then the heart and circulation, two systems that share one idea: surface area and gradients decide everything.
Inheritance & Variation
Genes and alleles, mitosis and meiosis, genetic diagrams, and natural selection, the topic with the most marks available for laying work out correctly.
FreeIntroduction to Biology & Cell Structure
Every living thing is built from cells, and what is inside them explains what it can do.
FreeMovement In & Out of Cells
Diffusion, osmosis and active transport, three processes with one comparison table, and the potato experiment the practical paper keeps returning to.
Organisms & Their Environment
Food chains and energy flow, the carbon and nitrogen cycles, populations, and human impact, the section where the marks are in the sequence of events.
Plant Nutrition & Transport
Photosynthesis with its limiting factors, leaf structure, and the xylem and phloem, plus the four experiments the practical paper asks you to describe.
Reproduction
Asexual and sexual reproduction, flowers and pollination, the human system, the menstrual cycle and pregnancy, a topic of comparisons and adaptations.
Respiration & Gas Exchange
Aerobic and anaerobic respiration, the breathing mechanism and the alveoli, plus the experiments that prove respiration is happening.
Biological Molecules
The four molecules life is built from, and how to test for each one.
Enzymes
The biological catalysts that make life fast enough to happen, and why a fever is dangerous.
FreeBioenergetics
How plants capture sunlight, and how every living thing releases the energy again.
Nutrition in Humans
What happens to food between your mouth and your bloodstream.
FreeTransport in Humans
The double pump, the pipes, and why the left side of your heart is thicker.
Gaseous Exchange & Respiration
How air gets in, how oxygen gets into your blood, and why breathing is not respiration.
Homeostasis & Excretion
How your body holds itself steady (temperature, water, sugar) without you thinking about it.
Coordination & Reproduction
How the body sends messages (fast by nerves, slow by hormones) and how life continues.
Inheritance & Evolution
Why you resemble your parents but are not identical to them, and how species change over time.
Chemistry 20
Acids, Bases & Salts
Definitions in terms of ions, the three reactions of acids, strong versus weak, the salt preparations and the ion tests, the most practical-heavy section on the paper.
FreeAtomic Structure & Bonding
Protons, electrons and the three kinds of bond, the section every later topic assumes, and the one where a dot-and-cross diagram is worth as much as an essay.
Chemistry of the Environment
Air, water, pollution, the Haber and Contact processes and fertilisers, the section that asks for chemistry and consequences in the same answer.
Electrochemistry
What is discharged where, and why, plus cells and fuel cells. A short topic with a strict logic, so it is one of the easier places to score full marks.
Energetics & Rates of Reaction
Exothermic and endothermic, bond energies, and collision theory, two sections the paper loves to combine into one graph question.
Metals & Reactivity
The reactivity series, displacement, extraction of iron and aluminium, rusting and its prevention, the section that links the periodic table to industry.
Organic Chemistry
Crude oil, the homologous series, alkanes, alkenes, alcohols, acids, esters and polymers, a topic of naming, drawing and one reaction type per family.
FreeStates of Matter
The particle model, diffusion, purity and the separation techniques, the practical-paper section, where knowing why a method works is the difference between a description and an explanation.
Stoichiometry & the Mole
Formulae, balanced equations, and the mole as the hub of every calculation, the section that turns up in every other topic and where working shown is the whole mark.
FreeStructure of Atoms
What everything is made of, and why the electrons on the outside decide how a substance behaves.
The Periodic Table
Groups, periods and the trends down Group I and Group VII, explained from electron shells, the section where "describe" and "explain" are two different marks.
Chemical Bonding
Why atoms stick together at all, and why salt is a hard crystal while water is a liquid.
States of Matter
Solid, liquid, gas, one substance, three behaviours, explained entirely by how its particles move.
Solutions, Acids, Bases & Salts
What makes lemon juice sharp and soap slippery, and how the two cancel each other out.
Fundamentals of Chemistry
The vocabulary everything else is built on: elements, compounds, mixtures and the mole.
The Periodic Table & Periodicity
Not a list to memorise, a map that predicts how an element will behave before you ever test it.
Electrochemistry
Using electricity to force reactions that would never happen on their own, and how metals get plated.
Chemical Reactivity
Why gold survives in the ground for millennia while sodium bursts into flame in water.
Organic Chemistry Basics
One element (carbon) builds millions of compounds, including every living thing.
Hydrocarbons & Chemical Industries
From crude oil to fuel, fertiliser and plastic, the chemistry that industry actually runs on.
Computer Science 30
Algorithm Design & Problem-Solving
Decomposition and abstraction, flowcharts and pseudocode, searching and sorting, validation and testing. Paper 2 begins here and most of its marks are for method.
Automated & Emerging Technologies
Sensors, microprocessors and actuators in closed-loop control, plus robotics, AI and extended reality, a short topic that rewards a precise control-loop description.
Boolean Logic
The six gates, truth tables, logic expressions and circuits, the most mechanical topic on the paper, and the easiest place to be certain of full marks.
Data Representation
Binary, hexadecimal, binary addition and shifts, and how text, images and sound are stored, a topic of conversions where the method must be shown.
Data Transmission
Packets, serial and parallel, simplex to full-duplex, error checking and encryption, a topic where each method must be paired with what it detects or prevents.
Databases
Records, fields and keys, flat file versus relational, data types and validation, and SQL, the topic where a query must be written, not described.
Hardware
The CPU and its registers, the fetch-decode-execute cycle, memory, storage and embedded systems, the topic where naming the register in the right order is the mark.
FreeProgramming
Variables and data types, the three constructs in pseudocode, arrays, sub-programs and file handling, the topic where the Paper 2 program is written.
Software
System and application software, the operating system, interrupts, and translators, a topic of clean distinctions that the paper tests directly.
The Internet & Its Uses
How a page reaches your browser, HTTPS and certificates, cyber threats and the measures against them, the section where every threat must be paired with a specific defence.
FreeIntroduction to Computers
What a computer actually is, what it is made of, and what it cannot do.
Input & Output Devices
How information gets into a computer and how it comes back out.
FreeNumber Systems & Data Representation
Binary, and how text, images and sound all become numbers.
FreeOperating Systems Basics
The software that manages everything else.
FreeAlgorithms & Flowcharts
Designing a solution before writing any code.
Computer Networks & the Web
How devices connect, and what actually happens when you load a page.
MS Word Basics
Creating, formatting and saving a document, and why formatting is about the reader.
Internet & Email Basics
What the internet actually is, how email travels, and how to judge what you find.
Introduction to Programming
Variables, conditions, loops and functions, writing code that works.
Programming Fundamentals
Data types, control structures, functions and finding your own mistakes.
Advanced MS Office Skills
Working efficiently in documents, spreadsheets and presentations.
Computer Safety
Protecting your device, your information and yourself.
MS Excel: Formulas & Charts
Functions, references and charts that represent data honestly.
Cyber Security & Ethics
Defending accounts and data, and the responsibilities that come with access.
Internet Safety & Cyber Ethics
Protecting yourself online, and behaving well when nobody is watching.
FreeComputer Hardware & Software
The physical machine, the instructions that run on it, and how they meet.
Introduction to Programming Logic
Sequence, selection and repetition, the three ideas every program is built from.
MS Excel Basics
Cells, formulas and charts, and why a spreadsheet recalculates itself.
Internet Browsing & Search
Searching precisely, and judging whether what you find can be trusted.
Digital Citizenship
Behaving well online, protecting yourself, and understanding that it lasts.
English 60
Argumentative & Discursive Writing
The difference between arguing a case and discussing an issue, and how to build paragraphs that persuade instead of merely asserting.
Descriptive Writing
Building a place a reader can stand in, through specific detail and controlled structure, not through a hunt for adjectives.
Directed Writing: Letters & Emails
Writing to a named reader for a stated purpose, where format, register and the bullet points you were given decide most of the mark.
Directed Writing: Reports, Articles & Speeches
Three forms with three different readers, and the conventions that tell an examiner within two lines that you know which one you are writing.
Grammar, Punctuation & Register
The accuracy marks that sit underneath every other question on both papers, and the handful of errors that cost the most.
Inference, Attitude & Implicit Meaning
What the passage suggests without saying, and how to prove it from the words on the page instead of guessing.
Narrative Writing
One moment told well in 450 words. How to choose a story small enough to finish, and end it without a dream, a death or a twist.
FreeReading Comprehension: Explicit Meaning
The marks nobody should lose: finding what the passage actually says, and saying it back in your own words without copying.
FreeSummary Writing
Twenty marks, one hundred and fifty words: selecting only what the question asked for, and writing it in your own words without a single example.
Writer's Effect: Language & Imagery
The question that separates grades: not what the writer said, but how the words work on the reader, and how to explain it without naming devices for their own sake.
FreeAdjectives & Adverbs
Words that describe things, and words that describe actions.
FreeNouns & Pronouns
Naming words, and the little words we use instead of them.
FreeRhyming Words
Words that sound the same at the end, cat, hat, mat!
FreeParts of Speech
The jobs words do, and why the same word can change job in a different sentence.
Simple Sentences
A sentence tells us one whole thing, with a capital letter and a full stop.
Tenses: Past, Present & Future
Talking about yesterday, today and tomorrow.
FreeVerbs & Tenses
Doing words, and how they change for yesterday, today and tomorrow.
Adjectives
Describing words that tell us more about a noun.
Sentence Types
Four kinds of sentence, and the punctuation that goes with each.
Synonyms & Antonyms
Words that mean the same, and words that mean the opposite.
Punctuation
Full stops, question marks, commas and speech marks.
Punctuation Basics
Capital letters, full stops and question marks.
Tenses: All Forms
Past, present and future, and the continuous forms that show something is still happening.
Reading Comprehension
Finding answers in a text, and working out what it means.
Vocabulary Building
How to work out a word you have never seen, and how to remember it afterwards.
FreeActive & Passive Voice
Two ways to build the same sentence, and knowing when each one is the right choice.
Reading Comprehension
Finding answers that are stated, and working out answers that are only hinted at.
FreeClauses & Conjunctions
Building longer sentences that stay clear, and punctuating them correctly.
Direct & Indirect Speech
Reporting what someone said, and everything that has to shift when you do.
Modals & Conditionals
Expressing possibility, obligation and hypothetical situations.
Active & Passive Voice
Converting between voices accurately, and choosing which one the writing needs.
FreeActive & Passive Voice: Advanced
Every tense, questions and commands, and choosing the voice deliberately.
Punctuation Advanced
Commas, apostrophes, colons and semicolons, the marks that change meaning.
Direct & Indirect Speech
Reporting speech accurately across every sentence type.
Direct & Indirect Speech: Advanced
Reporting accurately, and the reporting verb that carries an attitude.
Vocabulary & Idioms
Word families, shades of meaning, and phrases that do not mean what they say.
Comprehension & Inference
Reading closely enough to answer what is written, and what is only implied.
Essay & Letter Writing
Planning, structuring and finishing a piece that argues something.
Essay Writing & Literary Devices
Structuring an argument, and recognising the techniques writers use.
Reading Comprehension: Advanced
Reading for argument, tone and technique, not just information.
Vocabulary & Idioms
Building precision: word roots, connotation, and phrases that resist translation.
FreeParts of Speech: Advanced
The eight word classes, how they combine, and why the same word changes class.
Tenses & Subject-Verb Agreement
Twelve tenses, and making the verb match its subject every time.
Synonyms & Antonyms
Words with similar and opposite meanings, and why almost none are truly interchangeable.
Reading Comprehension
Working out meaning, purpose and viewpoint from a text.
Letter & Story Writing
Formal and informal letters, and building a story that holds together.
FreeAdvanced Grammar: Clauses & Tenses
Sentence structure and tense control at examination level.
FreeComprehension: Analytical Reading
Reading for argument, technique and bias at examination level.
Comprehension & Précis Writing
Reading closely, and compressing a passage without losing its argument.
Essay Writing
Planning, structuring and finishing an essay under examination conditions.
Formal & Informal Letter Writing
Register, structure and purpose, writing that gets the response you want.
Reported Speech & Voice: Advanced
Transformation across every construction, and the choices that carry meaning.
Novel & Drama Appreciation
Character, structure and theme, and writing about them with evidence.
Poetry & Literary Devices
Reading poetry closely, and writing about it in a way that earns marks.
Vocabulary & Figures of Speech
Precision, connotation and the devices that make language do more than state.
Vocabulary: Synonyms, Antonyms & Idioms
Precision, connotation and the phrases that resist logic.
Alphabet & Phonics
The 26 letters, the sounds they make, and the five special ones.
Nouns
Naming words for people, places, animals and things.
Reading Comprehension
Reading a short story and finding the answers inside it.
Reading Comprehension
Reading a passage carefully and answering questions about it.
Mathematics 119
Addition & Subtraction to 10,000
Adding and subtracting big numbers by keeping the columns lined up.
FreeAddition & Subtraction to 100
Adding and taking away bigger numbers, using tens and ones.
Addition & Subtraction to 1000
Working with hundreds, tens and ones, and carrying when you need to.
FreeAlgebra & Graphs
Factorising, quadratics, simultaneous equations, functions and sequences, the largest topic on both papers.
Approximation & Estimation
No measurement is ever exact. Learning to say how wrong a number might be is a more useful skill than getting more decimal places.
Coordinate Geometry
Gradient, midpoint, length, and the equation of a straight line, four tools that combine into every question.
Counting Numbers
Count from 1 to 10, and know what each number really means.
FreeDecimals
Numbers smaller than one, and why the column a digit sits in decides everything.
Geometrical Constructions
Two instruments, no measuring. Constructions are exact in a way a protractor never is, and the arcs you leave behind are the proof.
Geometry
Angle facts, polygons, circle theorems, similarity and congruence, bearings, proof-by-reasons is the skill being marked.
Integers
Negative numbers. What they mean, and why subtracting one adds.
Mensuration
Perimeter, area, volume and surface area of every shape on the formula sheet, and the ones that are not.
FreeNumber
Standard form, surds, percentages, ratio and bounds, a quarter of Paper 1 and the arithmetic every other topic stands on.
FreeNumbers to 1000
Hundreds, tens and ones. How every number up to 1000 is built.
FreePrimes, HCF & LCM
Every number is built from primes. Once you can see those building blocks, HCF and LCM stop being two rules to memorise and become one picture.
Probability
From "how likely" to tree diagrams, conditional probability and without-replacement, the reasoning the exam actually tests.
FreeRational & Real Numbers
The number families, how they fit together, and why some numbers never end.
Rational Numbers
One number, not two, and the four ways to see it that make everything else easier.
Speed, Distance & Time
One relationship, three questions. Get the units right and almost everything else follows.
Statistics
Averages from lists, tables and groups; cumulative frequency and quartiles; histograms with unequal widths.
Trigonometry
Right-angled triangles, then the sine and cosine rules for everything else, plus bearings and 3-D.
Vectors & Transformations
Column vectors, vector geometry and the four transformations, including how to describe one fully.
Addition 1-20
Putting groups together to make a bigger number.
FreeAlgebraic Expressions & Equations
Simplifying, expanding, factorising and solving, the core toolkit of algebra.
Algebraic Identities
Three patterns worth knowing by heart, and why they are true.
Basic Algebra
Letters standing for numbers, and solving an equation by keeping it balanced.
Fractions & Percentages
Three ways of writing the same amount, and how to move between them.
Multiplication Tables 2 & 3
Multiplying is just fast adding of equal groups.
Multiplication Tables to 10
The tables up to ten, and the patterns that mean you learn far fewer than you think.
Multiplication Tables to 5
The 2, 3, 4 and 5 times tables, and the patterns that make them easy.
Division
Sharing into equal groups, and what the remainder really means.
Division Basics
Sharing equally, and what to do when it does not divide evenly.
FreeEven & Odd Numbers
Numbers that make perfect pairs, and numbers with one left over.
Exponents & Powers
Index notation, the laws that make it work, and why anything to the power zero is one.
Fractions & Decimals
Operating with fractions confidently, and converting between the two forms.
Linear Equations
Solving equations with brackets, fractions and unknowns on both sides.
Money & Counting Coins
Counting rupees, paying for things and working out change.
Multiplication & Division of Large Numbers
Long multiplication and division, and the estimate that tells you the answer is sensible.
Exponents & Scientific Notation
Negative and fractional indices, and handling very large and very small numbers.
Find the Missing Number
Number detective! Spot what is missing in a line of numbers.
FreeFractions
Equal parts of a whole, and why a bigger bottom number means smaller pieces.
Heights & Lengths
Measuring how tall and how long, using centimetres and metres.
Money & Time
Reading a clock, and working out money problems.
Percentages & Simple Interest
Increases, decreases, and what borrowing money actually costs.
FreePerimeter & Area
The distance around a shape and the space inside it, two different questions.
Ratio & Proportion
Comparing quantities, sharing in a given ratio, and scaling recipes and maps.
Angles & Shapes
Measuring corners, and naming shapes by their sides and angles.
Data & Graphs
Collecting information, showing it clearly, and spotting a graph that misleads.
Direct & Inverse Proportion
When more means more, when more means less, and how to tell them apart.
Geometry: Angles & Triangles
Angle rules, types of triangle, and why the angles always total 180°.
Geometry: Congruence & Symmetry
Shapes that are identical, shapes that are scaled, and the balance in between.
Shapes & Geometry
Sides, corners, symmetry and measuring around a shape.
Shapes & Measurement
Flat shapes, solid shapes, and measuring around them.
Shapes & Patterns
Circles, squares and triangles, and patterns that repeat.
Data Handling & Probability
Summarising data honestly, and measuring how likely something is.
Measurement & Time
Length, mass, capacity and time, choosing the right unit and converting between them.
Mensuration: Surface Area & Volume
Measuring three-dimensional shapes, and why the units tell you the method.
Perimeter, Area & Volume
One, two and three dimensions, and why the units tell you which you are in.
FreePercentages
Out of a hundred, and how to switch between fractions, decimals and per cent.
Place Value & Rounding
Four-digit numbers, the value of each digit, and rounding to 10, 100 or 1000.
Place Value & Rounding to 100
Tens and ones up to 100, and rounding to the nearest ten.
FreePlace Value & Rounding to 1000
Hundreds, tens and ones, and rounding to the nearest 10 or 100.
FreePrime & Composite Numbers
Numbers with exactly two factors, and everything else.
FreeQuadratic Equations
Three solution methods, the discriminant, and choosing the right approach.
FreeReal Numbers & Indices
The number system, surds and index laws, the foundation everything else rests on.
Subtraction to 20
Take some away and count what is left.
FreeAlgebraic Manipulation & Factorization
Expanding, factorising and simplifying, the technique the whole syllabus depends on.
Factors & Multiples
Numbers that divide exactly, and numbers in the times table.
Fractions & Equivalence
Naming fractions, finding equal ones, and adding fractions with the same bottom number.
Fractions: Halves & Quarters
One half and one quarter of shapes and of groups.
Place Value & Ordinal Numbers
Tens and ones, and who came first, second and third.
Square Numbers
What happens when a number is multiplied by itself.
Squares, Cubes & Roots
Powers, the shapes behind their names, and how roots undo them.
FreeTrigonometric Identities
The relationships between the ratios, and proving one side equals the other.
Circles: Chords, Arcs & Tangents
The circle theorems, and writing a geometric reason that earns the mark.
Division as Sharing & Grouping
Sharing fairly, and making equal groups.
Halves & Equal Parts
Sharing fairly: two equal parts make halves.
Linear Equations & Inequalities
Solving and representing, and the one rule that reverses an inequality.
Negative Numbers
Numbers below zero, and how to compare and count through them.
Order of Operations
The rule that decides which part of a calculation you do first.
Order of Operations with Brackets
Why everyone gets the same answer, if they follow the rule.
Perimeter
Measuring all the way around the edge of a flat shape.
Angles & Triangles
Naming angles, classifying triangles, and the 180° rule.
Basic Statistics & Probability
Summarising data, reading it honestly, and calculating combined probabilities.
Introduction to Percentages
Per cent means "out of 100", and how that links to fractions.
Mass & Capacity
Grams and kilograms, millilitres and litres, and reading a scale.
Matrices
Arrays of numbers, the rules for combining them, and why order matters.
Money: Coins & Notes
Rupee coins and notes, and adding a few together.
Quadrilaterals & Polygons
Naming shapes properly, and the angle facts that come with them.
Symmetry & Reflection
Lines of symmetry, and how mirrors flip a picture.
3D Shapes & Nets
Naming solids by their faces, edges and vertices, and unfolding them.
Angles as Turns
Quarter, half and whole turns: the first idea of an angle.
Area & Perimeter
The distance round the edge and the space inside, and why they are not the same.
Circles: Parts & Construction
The vocabulary of circles, and drawing them accurately.
Introduction to Trigonometry
Relating angles to side lengths, and measuring what you cannot reach.
Lines of Symmetry
Finding horizontal and vertical lines of symmetry, and completing symmetrical patterns.
Measuring Length, Mass & Capacity
Longer or shorter, heavier or lighter, holds more or less.
Variations & Partial Fractions
Proportional relationships, and splitting an algebraic fraction apart.
Angles & Right Angles
Recognising right angles and comparing other angles to them.
Coordinates & Translation
Plotting points accurately, and sliding a shape without turning it.
Data Handling & Pictograms
Collecting data with tally marks and showing it in a pictogram.
Nets & Surface Area
Unfolding a solid, and adding up every face.
Symmetry & Nets
Lines of symmetry in 2D shapes, and the flat nets that fold into 3D solids.
Time: Days, Months & the Clock
Days of the week, months of the year, and o'clock on a clock.
Averages: Mode & Median
Two ways to describe what is typical in a set of data.
Chance & Likelihood
Certain, likely, unlikely and impossible.
Coordinates
Describing an exact position on a grid with a pair of numbers.
Data Handling & Bar Charts
Reading and drawing bar charts, and working out the difference between bars.
FreePosition & Direction
Above, below, left, right, saying exactly where something is.
Symmetry & Transformations
Mirror lines, turns and slides, and how to describe them precisely.
Chance & Probability
Using a likelihood line, and working out fair and unfair chances.
Coordinates in Four Quadrants
Negative numbers on a grid, and always reading x before y.
Data Handling & Graphs
Collecting data, choosing a graph, and reading a scale correctly.
Sorting & Picture Graphs
Put things in groups, then draw what you found.
Time & Timetables
The 24-hour clock, working out durations, and reading a timetable.
Averages: Mean, Median, Mode & Range
Four numbers that summarise a whole data set, and when each one lies.
Probability Experiments
Describing chance in words, and testing it by doing the experiment.
Probability Scales
Putting chance on a scale from 0 to 1, and writing it as a fraction.
Probability of Events
Putting a number on how likely something is.
Physics 16
Electricity & Magnetism
Charge, current, V = IR, series and parallel, power and the kWh, magnetism, motors, induction and transformers, the largest section and the one with the most calculation marks.
FreeMotion, Forces & Energy
Kinematics, Newton, momentum, moments, pressure and the energy chain, roughly a third of the paper and the section where units decide the grade.
Nuclear Physics
The atom, isotopes, the three radiations, decay equations, half-life, and fission versus fusion, a compact topic where every mark is either a definition or a piece of bookkeeping.
FreePhysical Quantities & Measurement
Every measurement is a number AND a unit, and getting either wrong makes the whole answer wrong.
Space Physics
The Earth–Moon–Sun system, orbits and the speed formula, the life of a star, and the expanding universe, a short, recently added section that rewards clear cause-and-effect answers.
FreeThermal Physics
Particles, the three ways heat moves, specific and latent heat, and the gas laws, the section where "explain in terms of particles" is worth a third of the marks.
Waves, Light & Sound
Wave vocabulary, reflection and refraction with the numbers, lenses, the EM spectrum and sound, a topic of definitions and ray diagrams where precision is the whole game.
Kinematics: Motion & Forces
How things move, and why they only change how they move when something pushes.
Turning Effect of Forces
Why a door handle is far from the hinge, and how a see-saw balances.
Work, Energy & Power
Energy is never used up, only moved and converted. Follow it and most problems solve themselves.
Thermal Properties of Matter
Why metal feels colder than wood at the same temperature, and why the sea warms so slowly.
FreeCurrent Electricity
What is actually moving in a wire, and why one broken bulb can kill a whole string of lights.
Electromagnetism & Basic Electronics
Moving charge makes magnetism, and moving magnets make current, the loop that powers the world.
Geometrical Optics
Light travels in straight lines, until it hits something. Then two rules explain everything.
Simple Harmonic Motion & Waves
The maths of anything that repeats, a pendulum, a guitar string, a radio signal.
Sound
Why thunder follows lightning, why a big drum sounds low, and why space really is silent.
Science 111
States of Matter & Changes
Solids, liquids and gases, and what the particles are doing in each.
FreeCell Structure & Function
The organelles, what each does, and why cells specialise.
FreeCells & Classification of Living Things
The building block of every living thing, and how we sort life into groups.
Human Body Systems
The systems that keep you alive, and how they depend on each other.
FreeMotion & Time
Speed as a calculated quantity, and reading motion from a graph.
FreeForce & Pressure
Why a sharp knife cuts and a wide foot does not sink.
Heat & Temperature
Two different quantities, and the three ways heat travels.
Human Digestive System
What happens to food between your mouth and your bloodstream.
Living & Non-Living Things
How to tell what is alive, and what is not.
Plant Life Cycle
From seed to flower to seed again, and why plants need animals to do it.
Acids, Bases & Salts
The pH scale, neutralisation, and why each step is ten times bigger.
Light & Sound
Two kinds of wave. How they travel, bounce and bend, and why one needs air.
Metals & Non-Metals
Properties, the reactivity series, and using it to predict reactions.
FreeMy Body
The parts of your body and the amazing jobs they do.
Simple Machines
Six devices that make work easier, and the trade you always make to get that help.
Animals & Their Homes
Where animals live, and why each home is just right for them.
Chemical Effects of Electric Current
What electricity does when it passes through a liquid.
Earth & Space
Day and night, the seasons, and the phases of the Moon, all from movement.
Nutrition in Plants & Animals
How plants make food and animals obtain it, two halves of one cycle.
Physical & Chemical Changes
Telling the difference, and the one question that decides it.
Natural Resources
Where materials and energy come from, and what happens as they run down.
Plant Parts & Growth
What each part of a plant does, and how a seed becomes a plant.
Plants Around Us
The parts of a plant and what each one does.
Pollution & Conservation
What damages air, water and land, and what actually works to stop it.
FreeStates of Matter
Solids, liquids and gases, and how one turns into another.
Weather & Climate
What we measure, why it changes, and the difference a timescale makes.
FreeAnimal Groups
Sorting animals by what they have and what they do.
Electricity & Magnetism
Making a bulb light up, and what magnets pull towards them.
FreeForces & Motion
Pushes and pulls, and why a rolling ball eventually stops.
Weather & Seasons
Sunny, rainy, hot and cold. How the weather changes.
Light & Dark
Where light comes from, and why shadows appear.
Sound
How sounds are made, how they reach your ears, and why some are loud.
The Water Cycle
The same water, going round the planet for ever.
Human Body: Skeleton & Muscles
The frame that holds you up, and the muscles that move it.
Life Processes
The seven things every living thing does.
Materials Around Us
What things are made of, and why we choose each material.
Caring for the Environment
Small things we can do to keep our world clean and healthy.
Habitats
Why a polar bear could not live in a desert, and how living things fit their homes.
Living Things in Their Environment
How animals and plants fit the place where they live.
Rocks & Soil
What the ground is made of, and how rock slowly becomes soil.
FreeAtomic Structure
What atoms are actually made of, and how to work out the numbers.
FreeCirculatory System
The heart, the blood and the vessels that carry it everywhere.
FreeMicroorganisms & Decomposers
The smallest living things, and the essential job they do for every ecosystem.
FreeParts of a Flower & Pollination
The reproductive parts of a flower, and how pollen gets from one to another.
FreeParts of a Plant & Their Functions
Roots, stem, leaves and flower, and the job each one does.
Vertebrates & Invertebrates
The great divide in the animal kingdom: with a backbone, or without.
Animal Groups & Classification
Sorting animals into groups by the features they share.
Balanced Diet & Nutrition
The food groups, what each one gives the body, and what a balanced plate looks like.
Chemical Equations & Reactions
Writing what happened, and making sure every atom is accounted for.
Elements, Compounds & Mixtures
The three ways matter can be organised, and how to tell them apart.
Health, Medicines & Disease
Staying healthy, how medicines help, and why vaccinations matter.
Respiratory System
How air reaches the blood, and what breathing is actually for.
Adaptation & Survival
How living things are suited to their environment, and what happens when it changes.
Food Chains & Food Webs
Producers, consumers, predators and prey, and how chains join into webs.
Human Organs
The main organs inside the body and what each one does.
Introduction to the Periodic Table
How chemists organised the elements, and why the arrangement is so useful.
Reactivity Series
Ranking the metals, and using the ranking to predict what will happen.
Reproduction & Puberty
How humans reproduce, and the changes the body goes through to become able to.
Chemical Reactions & Neutralisation
How to tell a new substance has formed, and what happens when acid meets alkali.
Chromatography & Separation
Choosing the right technique, and reading a chromatogram.
Disease & Hygiene
What causes infectious disease, how it spreads, and how the body and good habits fight back.
Food Chains
How energy passes from plants to animals, and what the arrow really means.
Particle Model: Solids & Liquids
Everything is made of tiny particles, and how they are arranged explains a lot.
Predators & Prey
The hunters and the hunted, the features each needs, and how their numbers rise and fall together.
Energy & Its Dissipation
Energy stores and transfers, and why energy always seems to run out.
Food Webs & Energy Transfer
How energy moves through a habitat, and why it runs out so quickly.
FreeMelting, Freezing & Boiling
Changing state by heating and cooling, and why it is always reversible.
Mixtures & Separating
What a mixture is, and how to pull one apart again.
Solutions & Dissolving
What dissolving really is, what changes the speed, and how to get the solid back.
Speed & Distance-Time Graphs
Calculating speed, and reading a journey off a graph.
Electromagnets & Magnetic Fields
Fields you cannot see, and magnets you can switch off.
Energy & Its Transfer
Where energy is, how it moves, and why it is never really used up.
Forces: Gravity & Friction
The pull that brings things down, and the force that slows them.
Sound Waves & Echoes
How sound is made, how it travels, and why it comes back to you.
Types of Forces
Naming the forces acting on an object, and drawing them as arrows.
Electric Current & Circuits
What current is, how to draw a circuit, and the real difference between series and parallel.
Light & Reflection
How light travels, how mirrors bounce it, and how we see things.
Light & Shadows
How light travels, and why shadows change size.
Respiration & Blood
The reaction that keeps every cell alive, and the system that supplies it.
Sound: Pitch & Volume
How sounds are made, and the two things that can change about them.
Circuits, Switches & Conductors
Building a working circuit, and testing which materials let electricity through.
Ecosystems
How living things fit together, and why the energy runs out.
Magnets & Magnetic Materials
Which materials are magnetic, how poles behave, and how magnets act at a distance.
Plate Tectonics
Why the ground moves, and why earthquakes and volcanoes are not scattered at random.
FreeTeeth & Healthy Eating
What our teeth do, and the food that keeps us well.
The Moon & the Earth
The Moon's orbit, its changing shape, and why all three are round.
Air, Water & Pollution
What air and water are made of, how we spoil them, and what can be done.
Growth & Life Cycles
How living things are born, grow and have young of their own.
Our Five Senses
Seeing, hearing, smelling, tasting and touching the world.
Renewable & Non-Renewable Resources
Where our energy actually comes from, and what each choice costs.
Solar & Lunar Eclipses
What lines up with what, and why eclipses are rarer than you would expect.
Volcanoes & Earthquakes
The layers inside the Earth, and what happens where its crust moves.
Galaxies & the Universe
The scale of everything, and how we know any of it.
Habitats
The place an animal or plant lives, and why it suits them.
FreeObjects & Materials
Everything is made of something, wood, metal, plastic, glass.
The Solar System
The Sun, the eight planets, and what else orbits with them.
Forces: Movement & Shape
How pushes and pulls change the way things move and look.
Mass, Weight & Gravity
Two words people use interchangeably that mean quite different things in science.
Push & Pull: Forces
Pushes and pulls make things start, stop and change direction.
Floating & Sinking
Some things stay on top of water and some go down.
Reflection & Refraction
Two things light does when it meets a new surface.
Simple Circuits
Making a bulb light up with a battery, wires and a switch.
Rocks & the Earth
Different rocks, where they come from and what we use them for.
Series & Parallel Circuits
Two ways to wire components, and why your house uses one of them.
Sound Around Us
Where sounds come from, and loud versus quiet.
Day & Night
Why we have day and night, and how shadows change.
Electricity & Safety
What needs electricity to work, and staying safe near it.
Rock Types & the Rock Cycle
Three families of rock, how each forms, and how they turn into one another.
FreeMagnets
Magnets pull some metals, and push each other away.
The Solar System & Beyond
From moons to galaxies. How the universe is organised, and how we know.
FreeThe Earth, Sun & Sky
Our Earth of rock and water, and the Sun that lights the day.