2007, the five BC full-length tests, and then the 2009 in that order. I left a day in between the last BC and the 2009 and then left two days after the 2009 and my actual DAT. I was exhausted by the end of my full-lengths though, so maybe space it out over two weeks.
After each test I would go through and study whatever I was unsure of but got right, and obviously anything you got wrong. Normally just studying the BC explanation should be enough, then pair that up with your Chad's notes or relate it to Destroyer problems somehow. I was burnt out by the last two days or so, so I didn't study much leading into the actual exam, just light review.