Dude, i know how you feel. I'm a sophomore and i like this chick.  I usually start out asking about homework. Then after "you got the help," ask her about what you think about a certain subject that she might be interested in.  The girl i like, likes Japanese anime and so do i, thus i ask her about what new animes came out recently.  If you know that she cares about you even a lil bit, ask her how her day was and listen to her no matter how annoying she gets.  Hint to her that you like her by actually commenting and listening.  I like to talk about "deep subjects" like "how corrupt society has become by media" and we just talk.  Get her to tutor you in a class you do poor in.  Or plainly ask her out.  DON'T STUTTER YOUR WORDS.  email me if you want more advise.  This stuff works for me.