This book is intended to help students prepare their GCSE examination in physics. It is not intended to replace a textbook but to supplement it. It is written to help students revise and prepare for an examination and assumes that they have completed a GCSE course. It is suggested that if there are topics that have not been studied the student should refer to a good textbook and carefully read and make notes on the relevant chapter. This edition has been updated to include new curriculum material on environmental issues, alternative sources of energy, and scientific investigation.