PM Heathcote & RSU Heathcote 
OCR AS & A Level Computer Science H446 [PDF ebook] 

The book is divided into 12 sections, each containing roughly six chapters. Each chapter covers material that can comfortably be taught in one or two lessons. It will also be a useful reference and revision guide for students throughout the A Level course. Content alicable to the A Level only is indicated throughout the textbook. Each chapter contains exercises, some new and some from past examination papers, which can be set as homework.