I used Chad's for a few topics to get a general idea of basic questions. Then I did the DAT Bootcamp QR practice tests repeatedly to understand how to do those questions. My DAT math section was very similar to the Bootcamp QR with the high yield questions showing up, then of course a few strange ones that I've never seen before.
Math is my weakest point, and I got a 19 doing that. But, the time really got to me. I'm sure I could have gotten a 20 or above if I tried to go quicker, but again I'm not great at math and couldn't properly work through a handful of questions near the end as the time began to tick down.
For PAT, DAT Bootcamp is all I used and I felt it prepared me well. But, I thought their tests and generators were a bit easier than the official test.