Honestly I love Chad and his videos were awesome, definitely helped me score a 25 on the OC section of the exam, but I felt like the Gen-Chem section on my DAT was NOTHING like what Chad covered, or what DAT Destroyer covered. Over half the questions I sat there and was thinking huh, this never popped in my studies (I studied for 2 months, and by the time I took the test thought I knew everything inside and out for Gen-Chem), I still ended up scoring a 21 (which was like 92 percentile on that exam) on the Gen-Chem section (was hoping for like a 28), but I felt like none of the study material, Chads, DAT Destroyer, qVault, or DAT Achiever were anything like the actual exam.
It seems to me that the exam is changing for 2013 and that it is trending towards becoming an overall harder exam. The biology section as well as the OC section both had many questions were I was unsure of answers, even though I felt like I was very prepared for both those sections through my studies. Luckily I must have had intuition on my side and got many of the questions I was unsure of right on both of those sections because I ended up scoring a 25 in Bio and a 25 in OC. Also my PAT section was very representative of DAT Achiever's PAT in that it was a very hard test, maybe a tiny, tiny bit easier than a DAT Achiever PAT, so be warned, do not expect it to be like CRACK DAT PAT, which by the time I was finished with my studies seemed like child's play.
So yeah moral of the story, DAT is getting harder. Don't expect it to be as easy as your practice material, expect it to be the hardest thing you have taken and you should come out all right!
I personally thought it was going to be much easier than it actually was because of how prepared I felt like I was after reviewing all study material (KBB, Cliff's, DAT Destroyer, Math Destroyer, Chad's, CRACK PAT, DAT Achiever, qVault) and literally felt like crying during my 15 minute break because of how hard the Survey of the Natural Sciences as well as the PAT sections of my exam were. I thought at the break that I had failed the test and would have to re-take ( I was thinking that I would score around 18-PAT and 18-AA). Luckily I was very shocked when I saw my score report saying I had scored 21-PAT, 23-TS, and 21-AA. So yeah don't expect the test to be easy like I did, it will only make you freak out during the actual exam, expect one of the hardest test you have ever taken in your entire life, because the exam as a whole is getting harder for 2013!