This book covers some of the syllabus, but seems to miss large chunks out and does not explain aspects in as much detail as you would expect seeing as it is written by the chief examiner. It would benefit from having a bit more colour and a few more diagrams. Unfortunately as the other reveiwer said, there aren't any other revision guides or text books for environmental science, so this is probably be the best bet. My advice is make sure you look through the syllabus for the year of your exam and make sure that you cover all the points in there. Don't simply rely on this book to get through your A-Level, try and use other sources. This is from experience, I am just about to sit my A-level exam.