If you have spent a long time away from school and aren't familiar with the material, maybe consider purchasing a subscription to study platforms such as DATCrusher or DATBootcamp. They offer lessons that walk you through all of the concepts which is a good idea if you need the guidance.
If you are confident in your self studying abilities, then you won't need to spend tons of money on those services. When I wrote my DAT in November I compiled all of the free resources I could find on the internet like textbook pdf's, notes, websites, and scored a 27 A.A. I even made use of free MCAT stu