what are good ways to open up in class?
get someone comfortable with you so when she steps into the class she looks for a seat right next to you.

im sure there are many ways, what have you done?

The most recent one I've done, which to a starter I don't recommend, is ignoring a girl like she doesn't exist, but exuding power and fun while your around her and showing her how awesome you are (not to show her, but to show your friends while she happens to be "watching"). Just yesterday I got a girl to sit next to me when it would've been easier to sit somewhere else, then she left her phone by me on the table and she left for 5 mins when I did this.
What you should do is make sure your in a class you can talk uninterrupted, if your teacher will tell you to be quiet every 5 mins opening is a waste of time, and do the 2nd half of the first part in what i did, show your powerful and fun - this is your opener, use a DHV story or talk about the classroom in a funny way, if everytime she sits near you she enjoys herself, why would she leave?

yeah that does sound like the way to do it. ill see what happens next time i see her. thanks!