Spagetti,

I would recommend the DSST Official Test-Preperation Guide. I found it a bit more helpful than snagglefrag did. That portion is actually downloadable at the petersons site I believe.
http://www.petersons.com/airforce/dsst.asp?sponsor=8
I'm glad I used both sources, but that is my study method. There are some threads in the past that you may want to go back and look at. Lots of input about the exam.