You can't just get a girl to like you. Now, I'm sure if you just asked her, she'd be happy to go out with you. That is, of course, unless she's already in a relationship with someone else.
I do however have some do's and don't's from my book. :) (Don't take all of these serious, I'm a pretty lighthearted, sarcastic girl who finds nearly everything attractive on my good and bad scale.)
1) Studies show that whenever someone is attracted to someone else, they naturally find a way to point their feet at them. Maybe fake drop your pencil and check.
2) Glance around the room if you think she may be staring at you. Make eye-contact for 4 seconds with her, then continue around the room, within another 2 seconds, come back to her gaze. It she lock it, and quickly looks away covering her mouth, she's probably interested.
3) Naturally, humans tend to fall for people we think look somewhat like us, to higher the chance of a respectable......? Yeah sure. This is because of evolution.
Wishing the best, Poetical.
**Now.. How to get a guy to like you?**