Book excerpt: Recaps the essential knowledge needed to prepare for the exams with summary and exam-style questions, maths skills activities, exam tips and advice. Double Award mapping is clearly indicated with an icon for those topics that are also covered in the AQA Level 1/2 Certificate in Science: Double Award. Key practicals and an advice section are included to support students experimental data handling skills, and answers to all questions appear at the back of the book, providing instant feedback.