Jobs flexible enough to work around a class schedule

I'm in the same boat trying to balance classes and money. In my experience, tutoring works really well because you pick your own hours and can do it around your schedule. I've also looked into freelance writing and virtual assistant work, which pays decent once you build up some clients. Have you thought about what skills you already have that people might pay for? That's usually where I start when I'm trying to figure out what to do.