I agree with Dentaldream, though I assume mmapcpro is still deciding which field to get into.
Personally, I took MCAT(last year) and DAT(this year). MCAT deals with ability to think a lot more than DAT (except for the PAT portion) In MCAT, they give u long passage and ask you questions from there. Sometimes you have to recall facts from your classes in order to find the answer. And the questions are quite tricky.
This year, I actually studied MCAT and DAT at the same time.
I basically treat DAT as MCAT and review and memorize most of the science stuff. I think the mentality and stress helped me a little to stay focus. Then after I got my DAT score(22AA/18PAT) back, I m exhausted and decided not to take MCAT =) And put my mind on just dental school ever since.
Like I have said, DAT questions are straight forward. Bad news is that either you know or you dont. For mcat, i feel like
The length is another issue.
DAT ~4 hrs. in prometric center, there are people taking other tests including the LSAT and GRE who students will type in the middle of your exam. Get ready to use headset(which they provide)
MCAT, i stayed in a huge lecture room and it took 10 hours.
Be sure to go to the gym before the test and train your back muscle.