The Credit books have been substantially revised from the previous editions to ensure that they are accessible to all students at this level and now have a 'fast track' route to allow for early presentation. Non-calculator work clearly identified throughout all books. Parallel content between all books allows movement between levels. 'Review' sections at the beginning of each chapter enable students to consolidate learning from previous chapters and establish knowledge required to proceed wit the topic. 'Recap' sections provide summaries of the chapter, making them an ideal revision tool. 'Revise' sections contain end of chapter exercises for revision and assessment, building up to exam style questions to ensure thorough preparation for exams.