This revision guide has been written for students who are preparing for CCEA GCSE Biology or the biology component of CCEA GCSE Double Award Science at Foundation or Higher tier. It follows the structure of GCSE Biology for CCEA and highlights the key concepts required. The book draws on the author's experience as an examiner and focuses on common misconceptions and areas where students often fail to gain full marks. As well as providing sample questions there are descriptions and explanations of typical mark schemes and guidance on how to improve your grades. Using this book throughout the course will help you fine-tune your understanding and develop your examination technique.