If you take the Kaplan course, the amount you get from the course (unfortunately) depends a lot on your teacher. My Kaplan teacher sucked, but we did have an AMAZING substitute one day. He memorized the names of every one in the class (in the first 5 minutes) then gave an awesome lecture that made the 3 hrs fly. We told him about some complaints we had about the course, and he took them up with his boss the next day (!). So if you get a good teacher, it really helps.
Other than that, Kaplan should be used as a supplement to studying. Yes, it is expensive and a lot of the classes are worthless. But if you have not taken gen chem/organic in 1-2 years (like me), it does a pretty good job of organizing and pulling together info. Kaplan also gives you a ton of test-taking practice (I think I took 7 practice DATs between class and online practice exams) so you can learn your rhythm and get used to staring at a computer screen for 4.5 hrs straight.
Things I wish I had known prior to taking the DAT, and stuff that Kaplan did not tell me (my fault for not researching better, but FYI in case...):
- Kaplan stresses that you get 2 blank sheets of scratch paper (more if you need it) Actually, I got two yellow dry-erase boards and markers. This sucked because obviously you can write smaller with pencils, and my 'scratch-paper' setup ended taking up an entire side of one of the dry-erase boards (periodic table trends, equations, formulas, etc). That was more of a nuisance than anything... the problem came during the QR. With these stupid boards you have to write huge, thus can't save math work (drawn pictures, calculations). So you cant save your drawings OR calculations (ie. you can't go back to check your work when you're done!). Check my QR score in predents (I had not scored below a 20 during practice exams in this section)
- Proctors were there... but in an adjacent room! I wanted to get paper instead of the boards, but I was 10 mins into my exam before anyone came walking around. Was not happy about this - as you know, even 2 or 3 wasted minutes trying to get someone's attention is huge, not to mention you will look like an idiot, flailing your arms around trying to signal someone through a glass door from your assigned computer.
Other than these minor things, Kaplan was OK and the DAT wasn't too bad. Let me know if you have any questions. Good luck!