This text has been designed to make revision as active and effective as possible. Short 20-minute revision sessions break down content into manageable chunks and should help to maximize students' concentration. An exam practice chapter at the end of the book provides detailed guidance on exam technique and makes sure students are fully prepared for the big day. Other features include: bullet points with highlighted words and phrases; A* extra information boxes highlighting likely exam questions and helping to ensure that the brightest students attain the very top grade; question spotter panels pinpointing the exam questions students are most likely to meet in their exam papers; and check yourself questions to test understanding.