Where or how to start studying for DAT if you need to review the materials a lot?

Hello! I'm planning to take the DAT this summer but I feel like I forgot a lot of the materials from Bio, Chem, OChem because they were taken 1-2 years ago. I know DAT Bootcamp and DAT Destroyer and most of the DAT study materials are practice problems. Where or how should I start studying for the DAT because I feel like I can't just go straight into the practice problems since I need to review a lot Please give advice!! Thank you so much!!
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