I do not have an answer for you, and I am not really well versed in all different test.
My kids tested through the talent search and they have never prepped, apart from getting to know the format of the test. My son never prepped for math SAT ad he scored 690, missing the SET by 10 points. The following year he did do some sample questions and his score was 790. Were we stupid not to prep him a little - I think we were.
Read the book - What High Schoold Don't Tell You.