There are a ton of products out there, and depending on your budget you should try the free versions of different resources and see what works best for you.
I'm using DAT Bootcamp (has free first test), DAT Genius (has free first test), DAT Destroyer, Chad's videos, Ferralis notes, and Ty Jacobs notes, and I feel like I have a lot of really good material to study from. Use Bootcamp/Genius for everything including PAT and RC, and the other resources for the sciences (and destroyer for math). Good luck.