Moms of little ones, how many pre-reqs do you take at a time?

I have a 7 yo, 5 yo (she turns 5 tomorrow!!!), and a 1yo. I am in school full time. I am very fortunate b/c the girls are in school while I am, and my son is cared for between my MIL, my mom, and one day of mother's day out. I start nursing school in the Spring, and I have been able to piece together care for him between my mom, MIL, and a drop in day care that he loves. The down side is it is very expensive.

For next year (Fall 2010), I will need to have him in full time daycare b/c I'll be in clinicals + classes.

This has worked well. I am insanely busy sometimes, but I stick to my schedule and have managed to make it all work out so far. It's definately worth it!