Hey man, I just finished my DAT today...
The best advice I could give you is to first, go through the Kaplan BB to refresh yourself on the basics. Then watch chads videos; I found that watching chads after Kaplan BB REALLY helped solidify what I need to know. Then I went through destroyer and the roadmaps, and I found maybe 7 or 8 reactions I didn't know, so I had very little additional information to learn. I got a 23, but I'm really bad at ochem so if you do things in that order it would be alot easier to memorize and I'm sure you'll do even better.