Leave a note saying, "I like you." -Your name. Then, put it on his locker.

ask him out.

DO NOT LEAVE A NOTE UNLESS YOU ARE POSITIVE HE LIKES YOU BECAUSE THE WORST THING YOU CAN DO IS LEAVE EVIDENCE IN PAPER THAT YOU LIKE HIM AND HES NOT INTERESTED AT ALL. THEN HIM AND HIS FRIENDS COULD MAKE FUN OF YOU!!!

I'm not saying he's not interested but if he wasn't and you left a note that would be bad