Go through everything as many times as you can, and focus on your weakest area's. Some people go through all of chad's video's, then do his quizzes. Others (and myself) will go through one section at a time, then do the questions corresponding to that section immediately after. Don't feel overwhelmed or panic. It will interfere with your studying, trust me. Just try and stay calm, breath, and study. And yea, destroyer's roadmaps are extremely helpful, but they will only get you so far. On the actual DAT, you may only get a handful of actual reactions. Anyway, I am currently using chad's, achiever, datqvault, datbootcamp, and KWB for this section. I also have the ochem odyssey, which I used for my first DAT, but I haven't used it yet. Good luck to you.