Endorsed by WJEC, this book offers high quality support you can trust. / Each topic includes detailed explanations and underpinning knowledge, all written in clear uncomplicated language. / 'Going further' and 'Study points' provide support and challenge for higher and lower ability students. / Exam practice and skills guidance is provided for the assessment objectives. / Requirements for practical work are thoroughly supported throughout. / Numerous questions, tests and tips help ensure you have a good grasp of the key content for each topic.