I am currently revising with this book at the moment. I find that it does have the basic information on the 20 core studies for the OCR course. but it is lacking in detail about core studies. this revision guide also lacks clarity and can be quite hard to understand at times. i have found though, that revising with the book and the website www.holah.co.uk is good in giving you the required knowledge. this book does, however focus on the key points such as strengths & weaknesses & ethical issues which is required for the exams. hopefully this helped a little bit.