"This OSC IB Revision Guide, written by an experienced IB teacher, provides a complete overview of the Environmental Systems and Societies course as well as practical advice on tackling the exam questions; it is useful throughout the course but especially before tests, mock and final exams. Active revision and review help the student target their effort where it is most needed. The book is excellent value and is concise, easy to use and wiro-bound so the pages lie flat."