Book excerpt: Endorsed by WJEC, this Study and Revision Guide supports students in preparing for their assessment and offers high quality support you can trust. / Written by experienced teachers and examiners, it provides the essential underpinning knowledge they will need to recap and revise the studies, theories and key terms. Supports the development of skills students need to correctly interpret and answer the exam questions. / Includes plenty of practice questions, with commentaries so they can see where mistakes are typically made and where extra marks can be gained. / An exam practice and technique section offers advice on how exam questions are set and marked.