I just guessed all the calculation question, and focused on the other types of questions, I got a 89% on it, not the best but better than busting my ass to learn all of those calculations to get a 93% whats it matter really? Best advice I can give is spend the 80 bucks or whatever get the KING ATP 121 prep spend two days just on the thing non-stop and go take the test, it wasnt bad at all, after seeing the questions you will know the answer on the real test from just reading the groups of answers..........good luck