I am taking classes while studying. So far it is working well.
I finished all my prereqs in the first 2 years and now I have about 1 year of classes left to do in 2 years.
Take classes that will help you with the areas you are weak in for the DAT.
I was weak in Physiology so I took a lower division class on it that also covers bio basics.
All my classes are either easy (fluff) or related to the DAT.
2 birds, one stone.