Posted by BEH0LD iTz SAM

If you already talk to her in class and think she has an interest in you then you are off to a good start already. Just start off by saying hello to her if you happen to walk by her outside of class. You don't have to say anything else since you are walking past but it could lead to her asking you something, so that you don't have to be the conversation starter if you aren't good at it. Then you can ask her similar questions she asks you so you know each other better.
Then if you haven't already add her on facebook, just talk to her every now and then on that, easier to do in person so that you further establish her interests. That will lead to you becoming more confident talking to her in person and then you can step it up by inviting her out to the movies or something. It doesn't have to be just you two, you could start off by inviting a group and include her and some of her friends, and lead it into you guys going just together.
The rest pretty much sorts itself out so goodluck

Posted by Colin

10/10 advice,

I always just act like I am the best looking guy in the room at all times, really helps with the confidence part. Just tell her straight up how you feel, if you try to slowly work your way in then there might be a chance another guy will come in and sweep her away. If the problem is your confidence then focus on that before focusing on her. Girls don't like guys who have low confidence.