Ah! So the key is that your target market is students. I didn't get that anywhere, and I'm wondering if narrowing your market this early is a good idea.

The thing is, this may be useful for more than just students, without changing the app at all, just how you refer to things.

Non-students, have similar scheduling/communications needs (I suspect), and you'll do great to target students first, but if "Class" had another label that appealed to more than just students, you may find your app being used in ways you didn't imagine. That may be a good thing.

Best of luck!