I bought this book along with TopScore CD. I looked at the reviews and thought this is a wonderful book for preparation for DAT. Well, it is not even close. The content in this book is not enough for the real DAT, especially the biology part. Fortunately I found this out before the test and I had to postpone the test one week later than I scheduled. I bought the Schaum's Outline for Biology and Chemsitry (two review books) and studied those two books intensively in the last week before DAT. Here is my scores: Bio 22, Gen 28, Org 25. I do think the Schaum's Outlines saved me from a big failure. I am glad that I didn't trust this book. And Schaum's books are amazingly inexpensive. That can save you about 20 bucks. And I am not selling my used Kaplan book here because I don't think it's that useful. Good luck with your test!