not saying to stalk her, but find something you might have in common (hobby, sports team, even a class or teacher in common, or mutual friend)....its much easier to start a conversation, even if it's a purposely made "offhand" comment
Thanks guys and girls for your answers . i really affraid so i dont look like a staker (For example i asked her how wasthe math test etc stuff like that. )
[im asing these bcoz im new in my school (joined like 1-2 mths ago) and... yea know wht i mean