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The format of those title has been updated for improved presentation. Definitions and fundamental points are now highlighted. Each topic is explained thoroughly in concise, lucid language - starting at level 7/8 of the National Curriculum. Worked examples and questions give students practice in calculations from first principles and an immediate test of their understanding of a topic. Designed to provide a link between GCSE and A Level, consolidation sections stress key points and in some cases provide an overview of a topic. Each section ends with a selection of questions, most of which have been taken from past examination papers. More than 200 questions have been added for the fourth edition.