So, here's my breakdown. Sorry for the delay.
I personally think that the level of difficulty of the actual DATs was way lower than destroyer and it was very similar to Topscore. So buy Topscore because it worths ever penny! I think I was over prepared for sciences. I did all 7 tests of Achiever, all Qvault and Top score as well. I went through destroyer 3 times. Here are the details of every section:
Biology:
It was tough. It was more difficult than destroyer and topscore. I had a couple of plants questions. I also got 1 classification question. I did not spend more than 30 sec on each question and I started Gchem when I had 1 hr:10 min. I did the same for Gchem and Ochem and when I finished all 3 sections I had 28 min left so I went back to Biology and changed at least 3 answers. I studied Cliff Biology, KBB, destroyer, achiever and qvault. I think if you study all these sources you will be fine. As you see although I got a 24 but my percentile is 99.6 which I think shows that this section was difficult. So do not panic stick to cliff and do qvault and topscore twice. you will fine.
Gchem:
Chad is the god 🙂 As everyone else mentioned he knows how to tach this. I am biology major and my chemistry was never good. I watched chad's videos twice and wrote every sentence he said. I went though destroyer 3 times and learned a lot. This is more than enough for your Gen chem. you will easily get 22+.
Ochem:
CHAD!! 🙂 Stick to chad's videos. I also did destroyer and the Romano's ochem book as well. With this you will easily get a 22+. Both Chems was easier than destroyer. The toughest questions were similar to destroyer. Remember, self confidence is the key. If you have already done what I mentioned you will be fine.
GChem/OChem: Destroyer ('08 ed., and a must for me personally,) Chad's videos (for ochem and gchem,) KBB, & KWB
PAT: was extremely difficult. The angles was on CDP level. The TFE was very confusing. I was consistently getting 22s-23s with CDP but I did not do well on real DAT.
QR: was difficult as well. I got 19 but my percentile is 92.9! I never got 19 in my practices. I think I was always good at math but it was difficult. I used Math destroyer. There was very similar questions to math destroyer. I did Math destroyer twice but I did not do well in that. So practice for this as much as you can. I had at least 2 statistics questions. many confusing speed and these kind of stuff. stick to Math destroyer.
RC: I think I am not eligible to advice anyone regarding RC sections because I am generally a slow reader. I read every first sentence of all paragraphs and then searched and destroyed the questions. You will do much better that what I did. I lost some time on first passage and then I had 35 min on the next 2 ones.
I will add all my practice exams later today for those who want to compare their scores.
