I am so in love but i dont know how to show it. Guys... Help!?

there is this kid who was my biology partner last yr and we were rele good friends and he stood up for me one time when i cried and i have been like in love with him ever since last yr. This year we dont have any cles together which is a real bummer but i still want him to know i like him a lot and i dont know how. Every tuesday when i go to my homeroom to change my books he has a cl in there and last tuesday he whistled at me and was like that was my lab partner last yr! and i was rele happy and i was blushing but he is one of those guys who think they are rele cool and he hangs out with those kinds of ppl so i cant go up to him but homecoming is next week and i rele want him to notice me!! Guys .. a little help please