Never gonna see her again after early January unless I make a move…what should I do?

So I’m in college and met this girl I really like this quarter through a class. Problem is, class is about to end and I won’t see her afterwards unless I do something. I’m graduating in the spring, but there’s still plenty of time before that.

We talk a lot when I see her and we get along really well, I have her number and we’ve texted a bit, although we haven’t been on a date or really hung out much outside of when we’re required to see each other. I’m not sure how to approach asking someone to hang out outside of school. I feel like I’m coming up on kind of a “do or die” situation.