These books are a must for any A level student studying the OCR course. Most revision guides tend to be very basis, but as this is designed to be an accompaniment to the course, the notes sections have just the right amount of detail needed. There are very clear diagrams for sections such as the structure of nephrons, and clear explanations for what is happening at each stage.
The second part of the book has practice exam questions for you to try. It also has two sets of candidate answers which are annotated so that you can see what OCR expect, and what makes a good answer.
Overall I am very impressed with the quality of these guides and will be purchasing the books for the other OCR modules.