My husband purchased this book to help him study for his exam. He said most sections were pretty helpful. However, he bought this mainly for the math sections. He asked me for help on some of the problems since I am a math major and he did not understand the solutions provided. However, at least two of the problems I noticed solve the problem a very difficult way. I had to show him a much simpler way to solve it. I also noticed that on one problem all the multiple choice answers are incorrect.