It’s brilliant and incredibly helpful.
If you, like me, struggle with these things this book is perfect. First of all, it includes examples for everything it explains, proof of students who have done the techniques given and gone on to get good marks. The techniques it gives are also very useful, I have started using them and I feel I have done more revision than I have in the rest of my school life put together. It also helps you create a good timetable starting from November the year before your exams, gives tips on the mental side of revising, and how to know you are revising the correct stuff in the correct way.
This book has really helped my revision get on track to good marks, I was sort of stuck in an “I’ll do it later” frame of mind and this book has completely changed that, I’m just disappointed I hadn’t found it sooner.
N.B. The book is only about 140 pages (some of those being diagrams), and all of it is useful, so do not listen to the reviews saying it is a pain to read and not worth the time; it really is.