I bought this book as well as the ARCO Master the Treasury Enforcement Agent Exam. The LearningExpress book oversimplified the questions. Having read it first, I thought the test was going to be very easy to pass, especially since I hadn't done that kind of math in about 8 years. Once I looked at the ARCO book, I realized it wouldn't be such a cakewalk. The ARCO book helped me pass the test. Had I simply gone off the LearningExpress book, I would have failed the math portion, no questions about it. I DO NOT recommend this book to anyone trying to get ready for the TEA exam.