Hello fellow Aggie! Seems like there are a lot of us right here.
I would suggest doing the following, but I am assuming that you have time to study 6-8 hour a day.
-Begin with Kaplan Blue Book @
www.amazon.com, read it thouroughly and take notes as you go along. This would probably take around 3 weeks.
-Start doing problems from DAT Destroyer, which can be purchased from
www.orgoman.com. Its essentially a book of problems, but I have heard that the problems are well thought out and the solutions are quite helpful. This would probably take another 2 to 3 weeks.
-At this point, I would suggest doing Crack the PAT to get suffiencient practice for PAT. The software can be purchased at
www.crackdat.com. The time it takes for this will depend on the version you get.
-Now would be a good time to do Topscore. It contains 3 full length mock DAT. The software can be purchased at
www.scholarware.com. Take the practice full length seriously. This can be done in 1 week or so.
-Now you can move onto DAT Achiever. Like Topscore, it also contains 3 full length mock tests, but it is much more difficult. The software can be purchased at
www.3tquest.com. This will probably take another week or so.
Lastly, it would be a good time to review all the questions you got wrong during those practice tests. Focus on what you are weak at and try to supplement with other sources such as your own textbooks, or Schaum's if you want to.(
www.amazon.com)
Hope it helps. To tell the truth the thing that I mentioned above would probably be my schedule if I were to take the DAT again.