First off, everyone aims for a 23-25. I don't mean that in a mean way, just understand that you'll get out what you put in, so a 23-25 requires a lot of effort from most people.
Second, I would suggest making or finding some sort of schedule to at least try to stick to. You can find some on here, and I believe DAT Bootcamp has a basic one you can follow. I did well on my DAT but I believe that I could have done better if I had had some structure to my studying.
Third, as far as materials go, thats gonna be based on what you can afford. I made a brief review of the materials that I used
here. If I was to take it again, I would use the same materials but just give myself longer to study because I feel that most everything was covered.
Before I started studying, I was on this site looking at DAT breakdowns for a solid week. I would suggest looking around at what other people think about the different materials as well. It just gives you a feel for what your getting into (It helped me out at least).
Put in the effort and use the study technique that works best for you! Best of luck to you!