Book excerpt: This book has been specifically edited for the two-tier GCSE specification by the highly successful author, David Rayner. The book is targeted at the Higher tier GCSE, and it comprises units organised clearly by topic. Each unit offers: BL Summary of objectives at the start so it is clear what students need to know BL Clear explanations with examples showing the key techniques BL Plenty of practice with clearly differentiated questions pitched at an appropriate level BL Summaries and past exam questions to help students gain responsibility for their learning It forms part of a series of two student books at GCSE, in which the other book caters for the Foundation tier.