I took the DAT years ago and have a slightly different opinion than everyone else. Back then, the only materials available were Kaplan's Blue Book, Barrons, and Topscore. I found Kaplan to be too general for me. Maybe if you did well in the pre-reqs this would be sufficient, but for me it wasn't. I'd recommend looking at AP books for the sciences and GRE books for QR. And once you have you're fundamentals down, you can bring it home with Destroyer and Achiever. Just my 2 cents.