Speaking as a teacher, this is an excellent book for students who haven't completed triple sciences at GCSE (i.e. you did Core/Additional Science or Science/Additional Science instead of separate Chemistry, Physics and Biology GCSEs). If you completed triple sciences, and especially if you got A/A* grades, then in all honesty you probably don't really need this book! But for those that didn't and who are going onto to A-level study, it's highly recommended. It's short and concise, with clear explanations. Well worth having a look through during the summer before you start your AS course, and also worth having to hand for the first couple of weeks for those times when everyone else in the class seems to already know something you have no idea about!