Sooo how do I get him to notice me?

Sooo there is this really hot college guy who comes to my school to pick up his sister. He is 18 and doesn't have a girlfriend. (his grandmother who speaks highly of him mentioned this once when we were talking.) last week his grandmother sat next to me and we were talking, then he appeared with his sister. We were subtly flirting not only with words but with body language too. After this we've barely seen each other (only from afar). Then yesterday when he came to the school he passed by me and then stopped to (fake because he did not actually do it) tie his shoes and instead of doing it he was pretending to tie but looking back towards where I was. Sooo what can I do?
Sooo how do I get him to notice me?
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