Fun practice, but may not be relevant
The math qestions in the book were pretty tricky, and I spend most of my time going over them. There were hardly any math questions on the actual exam. As with any study guide, you never really know if the questions on your exam will be similar to the book.
But it was fun to answer the practice book questions and see whether I was right.
Also, in the answer section, the book explains all the answers, and a review section in the front of the book gives an overview of the various subject matter.