Most Helpful Girl
Invite her with a group of shared friends, sit next to her in class and chat about stuff you would chat about with any guy in the same position (except the stuff girls are not interested in like cars and boobs and whatever guys like to talk about girls don't understand). Being funny is key!
I once had a great time with this guy I sat next to, we had a drawing and would take turns at drawing parts. It became a stoned version of the pringles guy. That's maybe a good original way to get contact?
When you know her better, ask her to hang out with the two of you. Still no meed to make it a real date, just have a fun time and the rest may follow by itself