Know your boundaries and ask him – whether you know him well or not – to respect your boundaries; if he doesn’t, walk away.
There are always the guys that have no qualms about coming in between a group of girl friends just to get some action.
Take it easy if you’re just getting your feet wet with the whole dating game, and don’t feel a need to rush into anything intense. Show face as often as you can without being that girl that everyone expects to run into.
If they’re showing up for class at all, then you know they’ve at least got something going for them.
On top of it, you might really connect with one of them.