My DAT Bootcamp scores in order starting one week before I took the DAT were as follows:
16/18/19/20
On the actual DAT I got a 20 for Reading. Do not get discouraged! Work on whatever technique you are using and stick with that for the exam. Also, I found the DAT Bootcamp length to be correct but the level of difficulty of the passages was much easier on the DAT, especially for 2/3 passages. And like people said before me, there are more search and destroy questions on the actual DAT.
I accidentally skipped 5 questions and didn't notice until the end so I just had to guess on those 5 w/o even reading the question. So, words of advice: make sure to review all of your questions at the end of each passage!