Review books are great for some people...but for people like me who have a short attention span...review books don't really do much for me.
Doing the questions in destroyer allowed me to be better focused, and when I read material in my textbooks afterwards...I was much more focused in my readings and retained way more information.
If you've taken the ochem, bio, gchem, you already have most of the foundations in place. Doing problems starting from day one isn't such a bad idea.
Here was my approach....
I pounded the destroyer starting from day one. First I went through it...understood it. Read up on anything that wasn't clear in the solutions in my TEXTBOOK...then I made notecards on all the material and memorized everything.
Pay special attention to the traps in the Destroyer. Dr. Romano knows the score, and he knows how to think like a test writer! I caught a few traps in the Real DAT that made chuckle.
Anyways, after I had pounded the Destroyer over and over....I went back to the kaplan book and scrutinized every word of it.
I found that, at that point, kaplan was rather basic. In other words, I everything in kaplan was elementary, but even better...I KNEW HOW TO APPLY THE MATERIAL IN NOVEL SITUATIONS!!!
This kind of method isn't for everyone...but I just think it's a different way of studying for the DAT. Everyone is different!
Good luck!