Ideal for mixed-ability or streamed sets. Harder topics exclusive to the Higher Tier (Grades A*- B) are clearly marked. Key concepts are easy to access in the text and important facts are summarised at the end of each chapter. Hundreds of questions to check understanding and to provide a framework for writing notes, revision and exam practice. Hundreds of optional experiments and investigations within the text with additional guidance to help students understand the results of their work. An extra section gives advice on practical work, revision and exam techniques. Extra support provided in separate Teacher's Support Pack.