The review quizzes. I started off timing myself and was only getting 40%. I shifted my focus to figure out how to do the math right, efficiently. After that I started to notice a significant improvement in my ability to solve the problems. This is when I started to work on my speed. I did end up running out of time on the real DAT as the problems were a bit more complicated than kaplan's but I ended up getting a 21 on the real thing for QR. I wanted to practice more with destroyer, I just ran out of time.