I'd like to note that the DAT does not have to be a test of memorization. The non-science sections are the easiest to score high on to boost your AA. QR is high school math, flat out. People put so much effort into memorization of science facts they lose track of basic math concepts. If you've graduated high school there really is no reason to not score 20+ on QR.
The PAT takes some practice but once you know how to do each of the mini-games its really easy. The only factor the plays into it is time, as you're rushed on this section.
RC tests how well you can read. You went to college and had to read scientific text at some point. You get a passage and have to answer questions - but can look back into the passage to find the answer. This also is really a test of time as the answer is literally on the screen, you just have to find it. If you score well on these three sections you're already guaranteed a 19+ AA.
Studying for the sections is a LOT faster than relearning the entire breadth of biology on the exam, which really is unfeasible to non-biology majors. There is too much biology to learn if you haven't learned it already, so focus your science studying into GC and OC, of which the material was covered in the basic dental prerequisites.
