This Study and Revision Guide provides essential underpinning knowledge, plenty of exam practice and advice on how to improve grades and avoid common mistakes. Endorsed by WJEC, it offers high quality support you can trust.Written by experienced teachers and examiners, it provides essential underpinning knowledge to recap and revise as well as supporting the development of skills needed to correctly interpret and answer exam questions. ┒ Exam practice and technique section offers advice on how exam questions are set and marked.┒ Plenty of practice questions are included with teacher commentaries. ┒ Grade boost tips help refine exam technique, improve grades and avoid common mistakes. ┒ Numerous diagrams clearly explain each concept. ┒ Pointers focus on understanding and using the underpinning knowledge. ┒ Key terms are clearly defined on each page. ┒ Quickfire questions check and reinforce understanding.