Library

Notes & lessons

The whole structure is public — find anything. Signing in unlocks the reading: the first 5 notes and 2 video lessons of the first 5 topics in every subject are free.

Biology 1
Mathematics 1

Biology

1 noteAll Biology

Photosynthesis: The Light-Dependent Reactions
What happens on the thylakoid membrane — photolysis, the electron transport chain, chemiosmosis, and why the products feed the Calvin cycle.
Free

Mathematics

1 noteAll Mathematics

Differentiation from First Principles
How the derivative is defined as a limit, why the definition works, and how to apply it to polynomials before you ever reach the shortcut rules.
Free

Reading is half of it.

The notes tell you what the syllabus says. A demo class tells you why you keep losing the same four marks.