In Quant reasoning, just like the other sections, there are certain topic areas that is bound to show up, guaranteed!
Use all the available DAT resources, however I do recommend going back and dig through some old high school, yes you heard me right, textbooks and work on the word problems. Do explect word problems, and prepare for those. The specialized test review books don't always provide enough practice to math problems, and sometimes, especially the word problems involving rates (ex. bob does this in 10 minutes, jill does this in 50 minutes, when will they both accomplished this task. Or... Dan is 5 years older than Moe. Moe is younger than Bart. How old are they in five years. You get my drift?) No DAT prep material has provided sufficient explanation, and practice for these kind of word problems, I recommend going through past text books and do them, do the example problems, do the practice problems, just do them!
I also looked at GMAT math review books, but those questions are slightly different, in fact harder. I do recommend this Kaplan Math Review book which they publish as a general tool for all standardized test.
If your weakness is word problems, like me, then I recommend hammering on those in your practice. You want to do the ones that you don't know how to.