Collaborative Tutorial Resources Initiative

Free textbooks for every student.

Open, step-by-step books for WAEC, JAMB and NECO. Volunteers write them in plain language, and people review them before we release them.

Why CTRI

Three things get in a student's way. We work on all three.

Good textbooks exist, but many families cannot afford them. Every CTRI book is free to read, download and print.

Free books are often written for students somewhere else. Ours are written for Nigerian classrooms, with examples students recognise.

Formal language can be a barrier. We write the way a good teacher explains, then show how the exam asks the question.

The books

Every chapter shows its status. A chapter appears as Released only after a person has reviewed and released it.

Six mini-books that take you from number work and algebra to geometry, trigonometry, statistics and probability.

1 released · 2 in progress · 23 planned

Soil science, crop production, animal husbandry and farm management, in practical, everyday language.

0 released · 0 in progress · 15 planned

From cells to ecology: the living world, explained for Nigerian learners.

0 released · 0 in progress · 15 planned

Measurements and mechanics, waves, electricity and modern physics, step by step.

0 released · 0 in progress · 18 planned

From atomic structure and bonding to organic chemistry, in a conversational style.

0 released · 0 in progress · 16 planned

How a chapter is made

A volunteer writes a topic: the idea, a picture or story, worked examples and practice questions.

Two different reviewers read it against sources. Nothing is released without review.

An editor releases the chapter with a version number and a note on what changed. Old versions are kept as PDFs.

A gift pays for writing sprints, reference materials and the systems that get these books to students who cannot reach them online.