This series is for the Cambridge International AS & A Level Computer Science syllabus (9618) for examination from 2021.  Developed by an experienced author and examiner team, this revision guide accompanies the coursebook and is written for the Cambridge International AS & A Level Computer Science syllabus (9618). It encourages students to practise their skills to help prepare them for the examination. The guide provides all the explanations to concepts that students have learnt throughout the course with a wealth of extra practice opportunities. Answers to questions are at the back of the book, so students are free to study in their own time.