TopScore is just three practice exams. You shouldn't even start looking at it until you have studied the material for a while. You can't do TopScore alone, you need Kaplan too. DMD_hopeful brings up a good point, the cost of DAT prep will pale in comparison to the cost of applying and interviewing, and this will pale in comparison to the cost of the education. I hate telling peope this, but you need to be prepared to throw down money to do well on the DAT.