I bought this book to teach me the syllabus then, a few weeks before my exams I bought various GCSE Biology revision books for exam prep. Within two days I ended up throwing the revision books to the side and began relying solely on this book again. It really is all you need, to buy any other book is, as I ended up finding out, a complete waste of money. The only fault with it is that it doesn't contain the answers to any questions but I'm sure you could find them on-line somewhere or ask a teacher.