This book provides a very, very basic review of the major concepts of biochem, cell biology, and molecular biology (i.e. genetics). I found this review helpful, but the detailed questions of the actual exam require a much more detailed review. This prep was also chaulk-full of typos, mistakes, improperly tagged vocab words, and incorrectly drawn chemical structures (texas carbons and nitrogens, double bonds to hydrogen atoms, etc.) that required me to look up the actual structure or correct definition. The practice exams were also a bit easier than the actual exam was, so an accurate gauge of how well you are doing cannot be obtained with this test prep. If all you need is a brief review before your subject exam, then this will probably work, otherwise review your old corsework and notes.