Where? Most jobs I can think of offhand that offer that sort of flexibility pay a pittance, like barely enough to live, let alone pay for large education expenses on top of that. I suppose you can also find work at night, while doing schooling for the day, but I wonder how the sort of sleep schedule imposed by that will effect you work in both.

I'm not saying it's easy, but especially in today's age with the popularity of online degrees, it's not impossible.