This book is a companion to Campbell Biology textbooks, so if your school uses something else, this book will likely be much less effective. This book has much of the same wording as the textbooks, so it feels very familiar and refreshes the memory quite well. Some of the things in this book were a bit esoteric for the exam, too specific for all but specialised recall questions with which the exam is not designed. The end of chapter practise tests were also too memory based, not enough general reading and scientific reasoning through questions. For the section on the evolutionary history of life, some of the answers in the back were wrong, seeming to come from different questions as the explanations answer totally different questions than the ones on the test. The actual practise test in the book was decent enough, with the same problem as the end of chapter tests, being a little too specific. It also had too few questions, 3 less than on the actual exam. The 1st FRQ is also rather ambiguously worded, asking for molecules in the membrane involved in transport but answering just for molecules in the membrane. It also didn't have any sort of conversion into an actual AP score, which made it hard to gauge how good you performed on the practise test. This book is useful for content review if you had the Campbell textbook to read during the year. Find practise tests on the College Board website, where the 2013 one, though also with fewer questions, allows for the conversion of your performance into a 1-5 score.