GCSE Music AQA Areas of Study Revision Guide (A*-G course) by CGP Books
This book is full of clear notes covering all five Areas of Study for the AQA exam board. There are loads of tips and quick test questions, as well as useful information about performance and composition. There's also a handy glossary at the back to explain all the tricky technical terms you need to know. It's all explained in straightforward language with the odd joke thrown in to help break up the revision!