This book (with free Online Edition) is full of clear revision notes and diagrams for Higher Level OCR 21st Century GCSE Core Science. It includes a section on "Ideas About Science", loads of exam advice and revision summary questions. Everything"s explained in straightforward language, with a touch of humour to keep things interesting. What"s more, a free Online Edition of the whole book is included - perfect for revising on a PC, Mac or tablet device.