O Level Notes, Worksheets and Quizzes
Choose a subject to browse its materials and quizzes.
Everything QuizByt publishes for O Level: 5 subjects covering 51 topics, 245 quizzes and 45 printable worksheets. Each topic has a lesson that advances one idea at a time, quizzes at three levels, and a worksheet with a separate answer sheet. The quizzes mark themselves and record a score against the topic rather than the subject, so a O Level student finds out which part they are weak on instead of only that the subject needs work. Everything is matched to Cambridge and Oxford standards, built with AI and reviewed by real teachers of each subject.
O Level Mathematics topics 9 Open Mathematics →
Number
Standard form, surds, percentages, ratio and bounds, a quarter of Paper 1 and the arithmetic every other topic stands on.
Algebra & Graphs
Factorising, quadratics, simultaneous equations, functions and sequences, the largest topic on both papers.
Geometry
Angle facts, polygons, circle theorems, similarity and congruence, bearings, proof-by-reasons is the skill being marked.
Mensuration
Perimeter, area, volume and surface area of every shape on the formula sheet, and the ones that are not.
Coordinate Geometry
Gradient, midpoint, length, and the equation of a straight line, four tools that combine into every question.
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.
Probability
From "how likely" to tree diagrams, conditional probability and without-replacement, the reasoning the exam actually tests.
Statistics
Averages from lists, tables and groups; cumulative frequency and quartiles; histograms with unequal widths.
O Level English topics 10 Open English →
Reading Comprehension: Explicit Meaning
The marks nobody should lose: finding what the passage actually says, and saying it back in your own words without copying.
Inference, Attitude & Implicit Meaning
What the passage suggests without saying, and how to prove it from the words on the page instead of guessing.
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.
Summary 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.
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.
Descriptive Writing
Building a place a reader can stand in, through specific detail and controlled structure, not through a hunt for adjectives.
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.
Argumentative & Discursive Writing
The difference between arguing a case and discussing an issue, and how to build paragraphs that persuade instead of merely asserting.
Grammar, Punctuation & Register
The accuracy marks that sit underneath every other question on both papers, and the handful of errors that cost the most.
O Level Physics topics 6 Open Physics →
Motion, 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.
Thermal 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.
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.
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.
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.
O Level Chemistry topics 12 Open Chemistry →
Atomic 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.
States 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.
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.
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.
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.
Metals & Reactivity
The reactivity series, displacement, extraction of iron and aluminium, rusting and its prevention, the section that links the periodic table to industry.
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.
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.
Experimental Techniques & Chemical Analysis
Reversible Reactions & Equilibrium
O Level Biology topics 14 Open Biology →
Cells & 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.
Movement 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.
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.
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.
Human Nutrition & Transport
Diet, digestion and absorption, then the heart and circulation, two systems that share one idea: surface area and gradients decide everything.
Respiration & Gas Exchange
Aerobic and anaerobic respiration, the breathing mechanism and the alveoli, plus the experiments that prove respiration is happening.
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.
Reproduction
Asexual and sexual reproduction, flowers and pollination, the human system, the menstrual cycle and pregnancy, a topic of comparisons and adaptations.
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.
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.
Diseases & Immunity
Drugs & Their Effects
Human Influences on Ecosystems
Biotechnology & Genetic Modification
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