Chad's videos were really helpful to me for ochem and gen chem. Took my DAT yesterday and got a 25 in gen chem and a 20 in organic chem - didn't finish chad's for ochem tho :-/ wish I would have. DAT bootcamp and qvault have pretty great questions for all sections, saw a couple repeats on my DAT actually. I wouldn't advise Chad's for quant reasoning, I knew it inside and out and got a 17 yesterday on the QR... ugh
AA was a 20, hopefully I get in with that. Hope this helps you!