This is the best online revision guide for CS students.

Written by a Grade 9 GCSE Computer Science student, this guide contains everything you need to know in order to succeed in your exams.

Over 150 pages of content for GCSE and A Level.

This revision guide covers the whole GCSE and A Level Computer Science courses.

Including 300+ questions throughout the guide.

Organised into summary questions at the bottom of each page, and exam-style revision questions at the end of each section.

CS.RN v2 is 100% free, with no ads.

This revision guide will always remain completely free and open source.