I agree with Mitch - while most people do better than their Topscore or Barron's average, it is not a guarantee of your performance come test day. I don't know what it is about the PAT but, yes, just about everyone's score takes a dip on the DAT vs. their practice exams. The key is not to get lulled into a false sense of security by your practice scores - keep studying and pounding those concepts into your head. That's the trick to getting a good score on the DAT.