approach her, tell her you love her and want her to be your girlfriend.
or send anonymous letters to her saying the above.
watch her at night, learn about her so you know her better. but dont get caught. people get upset about people spying.
if you know enough about her she will think you were meant to be together, so get studying. know her favourite drink, and buy her one. leave it on her bedroom window for her to see in the morning.
worked for me.