I have received email messages about the test. Hopefully, I can answer some of them with this post.
I did not see any dat achiever questions on my actual test. I have no clue why one person @ sdn kept insisting he saw 10 questions that were very similar to dat achiever questions. I don't recall seeing any question that was similar to any dat achiever questions. I believe the real RC was harder than any practice RC. I spent most of my time studying for the natural sciences (biology, G & O Chems) eventhough I knew RC is my weakness. English is not my first language. I thought that I couldn't drastically improve my RC in a couple of months. So, I decided to focus more on the sciences. I think it paid off. My total science score was @ 99% percentile. I only finished reading Kaplan's review notes for biology. I didn't do all the biology questions at the end of the chapters. Those questions are good and maybe very helpful but since I didn't look at them I don't know if any of them showed up on my test. I took all the subject tests once. I only read the review notes for biology but watched all the lesson tapes @ kaplan (chem, bio, rc everything). In retrospect, TopScore, Dat achiever, Ace, KSF didn't help me much. I believe Kaplan and college textbooks are more than enough for the sciences.
Here are my views about practice tests:
College textbooks: Best way to study. 5 stars
Kaplan: Overall very good 4.9 stars
ExamCrackers series including the 1001 series: very good 5 stars
TopScore: RC is much easier than the real RC, PAT useless (take ADA sample test instead), Bio: read Campbell. QR has mistakes, 2 stars
Achiever: QR & RC easier. PAT harder. SNS harder. Actually, I felt O'Chem was about the same. Surprisingly, I got about the same O'Chem score. Didn't expect that. One thing about achiever's QR: they used derivatives to solve one of the problems. I didn't need to know derivatives for my test !!! 3 stars
KSF = can be good in the future. 1 star overall, negative 2 for their PATs
Ace = Crap. To the authors: Are you sure you passed your science classes and got in dental school? Which undergrad and dental schools did you guys go to?! negative 5 stars
Dat professor = written for DAT or some other test?! I still haven't figured this out. star = N/A
If and when I decide to study for the DAT again I'll mainly use my own textbooks (and Kaplan). I don't agree with anyone who thinks you need to go beyond these. "You fooled me once shame on you. you fooled me twice shame on me." -> very applicable if I use any of the other practice materials again.
I won't tell anyone actual test questions. I don't want to lie to any of you by saying I remember nothing. I don't think I missed more than 2 questions in each of the three science sections. I remember which ones gave me trouble but I won't post the questions. If you have any other questions feel free to ask.
... lalala.... 
