I'm in a job where I deal a lot with standardized testing. So when my kid had to take this test, I bought several practice books. This one is hands down the best. First, it provides a ton of practice questions for each section. It is unlikely that any test you'll get won't have versions of some of these questions. Second, it provides full length tests. Third -- and most importantly -- the associated website has detailed answers on how to do each problem if you get stuck AND provides links to videos on YouTube and other sites that explain the different math techniques, for example, in case you haven't learned them in school. The only thing I think they could do better is to provide better explanations on techniques in the actual book in case people don't go to the website. Overall, if you buy one book, this should be the one.