So, I just did the QR sections of the practice tests in the Cliff's DAT book. I finished with 10 minutes to spare for each test (wayyy faster than normal) and I got a 26 and 23 respectively, which is higher than what I have been typically getting with Crack the Math. I think the Cliff's book is a little too broad/easy, but it is good extra practice to get you in the mindset of taking the test. I didn't do the 2006 ADA test, but I did do the free sample questions on the ADA website, and that seemed a bit easier than normal as well. I would do them for practice, but maybe don't expect such high scores on the real thing...