I don't think kaplan is worth the money. I have a ton of books i used that helped me score in the range you desire. I took tha Kaplan course, and I have first hand knowledge that I did not gain a lot out of it.
If you think spending 1,000 bucks will motivate you, then by all means go ahead, but if you are dedicated for 3-5 months you can easily excel on this test.
i was cleaning out my room and i found a ton of resources that I used for the DAT and they really helped me. If you are interested please email me or PM me.
DesiDentist