Prep Expert really has given me a new perspective on test-taking. I never realized how important this class was and now that I'm writing this, I am so glad I know its importance: you learn how to take tests, learn time management, and learn valuable skills. I have seen my score on the practice tests literally go up every time from 1250 to 1310 to 1420 all in about a month. Prep Expert is indeed a great place if not the best place to start for practicing for the SAT/ACT tests. P.S. In regards to the money-back guarantee thing, you have to do be consistent with the work they assign because if you aren't, you most likely won't get the guarantee.