Understand the idea. Then try it yourself.

Free explanations for IB and IGCSE, with worked examples and a question to check your understanding.

Read these guides without an account. Each connects to a lesson in Find Tutor Studio, where the first two published lessons per subject are open to everyone. Further interactive lessons require an account.

IB Physics

Distance, displacement, speed and velocity
Acceleration and the SUVAT equations
How to read displacement–time and velocity–time graphs
Projectile motion: horizontal and vertical components
How to draw a free-body diagram
Hooke’s law and spring force

IB Mathematics: Analysis and Approaches

Arithmetic sequences and their sums
Geometric sequences and finite sums
When does an infinite geometric series have a sum?
Logarithms as the inverse of powers
The laws of logarithms

IB Chemistry

Elements, compounds and mixtures
The particle model: temperature and changes of state
Atomic number, mass number and electron count
Isotopes and relative atomic mass

IB Biology

Why is water a polar molecule?
Cohesion, adhesion and water transport

IGCSE Mathematics

Standard form: writing very large and small numbers
Upper and lower bounds after rounding
Converting fractions and decimals

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