This is extremely difficult to answer in such a broad area (the Internet). Considering each school teaches things a bit differently and each teacher within each school. I think you're asking the wrong set of people. For instance, I took cell bio just before taking the DAT and it was the most worthless class I had taken yet! I learned more about the cell and it's processes/functions in bio 101. That is just an example of the large discrepancies between professors; let alone between different institutions.
That being said, I'd find your school's pre dent club or pre health professional's club and ask those who have both taken the DAT and studied at your school. They should be able to give you a better plan of attack for classes prepping for the DAT. Good luck!