I personally used:
PAT - PATBooster, best practice for PAT out there. There's some pretty good free YouTube videos too.
BIO - Dr. Romano's Dynamite Biology Review (free on his Facebook study group) and the general Destroyer (2019 version)
OC and GC - General Destroyer (2019 version) and Klein textbook (I used the second edition) for reference
RC - ScienceDaily articles
QR - General Destroyer and Math Destroyer (both 2019 versions)
I highly recommend all of these resources. You'll end up spending ~$300, maybe a little less. Regardless of what resources you get, you're going to need to put in a ton of time and effort. But hey, it's worth it for getting into dental school. I scored a 25TS/27AA/25PAT.