IB · IGCSE · A-Level · Lower Secondary · Primary

See every concept,
then practise it.

An interactive library of 1,566 science, maths and English lessons, from Cambridge Primary to IB and A-Level. Explore an idea, try it yourself and practise what you have learned — on your own, or with a tutor.

Sign in How it works

ConceptSmaller atom, stronger pull3 / 8

Cl: only 3 shells — strong pull on incoming electron.

Br: 4 shells — moderate attraction.

I: 5 shells — weak pull, least reactive.

31

subjects

620

topics

1,566

lessons

894+

hours of content

The library

31 subjects. One standard of craft.

Every lesson follows the same proven arc — hook, visual explanation, interactive practice, exam-style test. Open any topic in any programme and you'll find the same careful work underneath.

IB

International Baccalaureate

Full IB Diploma Programme — all standard and higher level subjects

All IB subjects

Physics

From quantum mechanics to cosmology — build deep intuition for how the universe works through simulation, derivation, and exam practice.

24 topics73 lessons

Chemistry

From atomic structure to organic mechanisms — build deep understanding of matter and its transformations through models, particle diagrams, and exam practice.

22 topics81 lessons

Mathematics: Analysis and Approaches

Pure-mathematical core of the IB Diploma — calculus, algebra, functions, vectors, statistics, complex numbers, induction, and series. SL and HL share lessons; HL-only topics are clearly marked.

25 topics77 lessons

Mathematics: Applications and Interpretation

Modelling, statistics, and applied mathematics for the IB Diploma — financial maths, regression, probability, distributions, calculus in context, Voronoi diagrams, and (HL) graph theory, vectors, matrices, and differential equations. Both papers GDC-required.

10 topics71 lessons

Biology

Life from molecule to ecosystem — four themes (unity & diversity, form & function, interaction & interdependence, continuity & change) and the experimental craft of biology. SL and HL share lessons; HL-only topics are clearly marked.

40 topics113 lessons

A2

A-Level

Edexcel International A-Level qualifications — Physics (YPH11), Chemistry (YCH11), Biology (YBI11) and Mathematics (YMA01) live, more subjects coming

All A2 subjects

Physics (Edexcel)

Edexcel International Advanced Subsidiary (IAS) and Advanced Level (IAL) Physics — Units 1-6 spanning mechanics, materials, waves, electricity, fields, thermodynamics, radiation, oscillations and cosmology, with practical skills.

13 topics39 lessons

Physics (Cambridge)

Cambridge International AS & A Level Physics (9702) — AS and A2 content across mechanics, waves, electricity, fields, thermodynamics, oscillations, magnetism, quantum and nuclear physics, with the Cambridge practical-skills papers.

26 topics33 lessons

Chemistry (Edexcel)

Edexcel International Advanced Subsidiary (IAS) and Advanced Level (IAL) Chemistry — Units 1-6 spanning structure, bonding, organic chemistry, energetics, group chemistry, kinetics, equilibria, redox, transition metals, and analytical methods, with practical skills.

22 topics71 lessons

Chemistry (Cambridge)

Cambridge International AS & A Level Chemistry (9701) — AS and A2 content across physical, inorganic and organic chemistry plus analytical techniques, with the Cambridge practical-skills papers.

24 topics70 lessons

Biology (Edexcel)

Edexcel International Advanced Subsidiary (IAS) and Advanced Level (IAL) Biology — Units 1-6 spanning biological molecules, transport and health, cells and development, biodiversity, energy flow, microbiology, immunity, respiration, the internal environment, coordination, and gene technology, with practical skills assessed in Units 3 and 6.

10 topics74 lessons

Biology (Cambridge)

Cambridge International AS & A Level Biology (9700) — AS and A2 content from cell structure and biological molecules through transport, gas exchange, disease and immunity, energy, homeostasis, coordination, inheritance, evolution and genetic technology, with the Cambridge practical-skills papers.

20 topics76 lessons

Mathematics (Edexcel)

Edexcel International Advanced Subsidiary (IAS) and Advanced Level (IAL) Mathematics — 11 modules: Pure Mathematics P1–P4, Mechanics M1–M3, Statistics S1–S3 and Decision Mathematics D1. Covers algebra, coordinate geometry, trigonometry, calculus, vectors, mechanics, statistics, probability distributions, hypothesis testing and discrete optimisation algorithms.

67 topics106 lessons

Mathematics (Cambridge)

Cambridge International AS & A Level Mathematics (9709) — the six components: Pure Mathematics 1, 2 and 3, Mechanics, and Probability & Statistics 1 and 2.

38 topics90 lessons

IGCSE

Cambridge IGCSE

Cambridge IGCSE Biology (0610), Chemistry (0620), Mathematics (0580) and Physics (0625) — master core sciences and mathematics

All IGCSE subjects

IGCSE Mathematics 0580

Mathematics

Cambridge IGCSE Mathematics (0580) — master number, algebra, geometry, trigonometry and statistics with interactive visual lessons and exam practice.

10 topics21 lessons

IGCSE Biology 0610

Biology

Cambridge IGCSE Biology (0610) — master cells, organisation, biological molecules, enzymes, plant and human nutrition, transport, gas exchange, respiration, excretion, coordination, reproduction, inheritance, variation, ecology and biotechnology with interactive visual lessons.

48 topics50 lessons

IGCSE Chemistry 0620

Chemistry

Cambridge IGCSE Chemistry (0620) — master atomic structure, bonding, reactions, organic chemistry and more with interactive visual lessons and exam practice.

14 topics28 lessons

IGCSE Physics 0625

Physics

Cambridge IGCSE Physics (0625) — master motion, forces, energy, thermal physics, waves, electricity, magnetism, nuclear and space physics with interactive visual lessons and exam practice.

24 topics45 lessons

CLS

Cambridge Lower Secondary

Cambridge Lower Secondary Mathematics Stage 8 and Science 0893 (Stages 7–9)

All CLS subjects

CLS Mathematics 0862

Mathematics

Cambridge Lower Secondary Mathematics Stage 8 — build confidence with numbers, algebra, geometry and data through interactive visual lessons.

9 topics18 lessons

CLS Science 0893

Science

Cambridge Lower Secondary Science Stages 7–9 — build foundations in Biology, Chemistry, Physics and Earth & Space through interactive visual lessons, preparing learners for Cambridge Lower Secondary Checkpoint.

36 topics54 lessons

Primary

Cambridge Primary

Cambridge Primary English and Mathematics Stages 1–6, with lessons, practice, interactive activities and original assessment papers.

All Primary subjects

0058 · Stage 4

English — Stage 4

Cambridge Primary English 0058, first-language Stage 4. Follow The Riverside Journal through 12 units and 48 lessons, with reading, writing, language, speaking and listening, 720 practice questions and original assessments.

15 topics48 lessons

0096 · Stage 1

Mathematics — Stage 1

The Garden Trail: 9 units, 18 lessons, 124 practice questions, 18 unit reviews and four full-course practice papers.

9 topics18 lessons

0096 · Stage 2

Mathematics — Stage 2

The Neighbourhood Market: 12 units, 24 lessons, 164 practice questions, 24 unit reviews and four full-course practice papers.

12 topics24 lessons

0096 · Stage 3

Mathematics — Stage 3

The Discovery Centre: 10 units, 20 lessons, 138 practice questions, 20 unit reviews and four full-course practice papers.

10 topics20 lessons

0096 · Stage 4

Mathematics — Stage 4

The Island Research Camp: 9 units, 20 lessons, 132 practice questions, 18 unit reviews and four full-course practice papers.

9 topics20 lessons

0096 · Stage 5

Mathematics — Stage 5

The Riverside Makers Fair:12 units,40 lessons,552 practice questions,24 unit tests and4 original full-course practice papers.

12 topics40 lessons

0096 · Stage 6

Mathematics — Stage 6

The Future Town Challenge: 11 units, 26 lessons, 175 practice questions, 22 unit reviews and four full-course practice papers.

11 topics26 lessons

0058 · Stage 1

English — Stage 1

The Little Book Garden: 12 units and 36 guided lessons in reading, language, writing and spoken communication.

12 topics36 lessons

0058 · Stage 2

English — Stage 2

The Travelling Story Box: 12 units and 36 guided lessons in reading, language, writing and spoken communication.

12 topics36 lessons

0058 · Stage 3

English — Stage 3

The Island of Many Stories: 12 units and 36 guided lessons in reading, language, writing and spoken communication.

12 topics36 lessons

0058 · Stage 5

English — Stage 5

The Lantern House Review: 12 units and 36 guided lessons in reading, language, writing and spoken communication.

12 topics36 lessons

0058 · Stage 6

English — Stage 6

The Harbour Archive: 12 units and 36 guided lessons in reading, language, writing and spoken communication.

12 topics36 lessons

01

Play the concept

Explore ideas through interactive activities and simulations, with explanations that build step by step.

02

Practise what you learn

Try questions for your subject with clear feedback. Reading lessons use original stories; exam courses include practice based on mark schemes.

03

Add a tutor when you want one

Mostly learning solo but stuck on something? Tap Find a Tutor and we'll match you with a real tutor over WhatsApp.

Rather learn with someone?

Tell us the subject and level, and we'll match you with a real tutor over WhatsApp.

Start with two lessons free.

Two free lessons in any subject — no sign-up needed. Then one sign-in unlocks all 31 subjects, 1,566 lessons and 894+ hours of interactive teaching.