- This guide provides crisp revision of all syllabus topics with detailed support for constructing, analysing, labelling diagrams to assist with complete understanding. In addition, students will learn how to design, select and use diagrams to explain concepts while answering examination questions. A "tips" section provides practical suggestions and a complete glossary provides a much needed teacher and student reference. In addition, there are guidelines on examiner recommendations and information on the extended essay and the internally assessed component of the course. Finally there will be exam practice with a selection of past questions including examiner advice.