When I first looked at the chapters of the book, and read the information on index of my specification I knew I had the wrong book. It said that my Edexcel Biology exam unit 1 was 1hr 30 minuets, when in reality it is 1hr. I found the information to miss out key points in the specification, and to not answer all the syllabus points. I have given up using this book to revise for my biology module January, and am using instead the Nelson book in Cell Biology and Genetics which goes into much more detail and covers all the syllabus points.
This is good for looking over once you have a revised, but as an actual revision book, it is severely lacking.