Most Helpful Guy
Wear something very sexy, and flattering to your figure. Man sure you look the best. Hang out with your friends and enjoy yourself as usual. Don't be loud and annoying. Find a reason to walk past him a few times, be sure he sees you. You can be clandestine or as bold in your attempt as you like. The guy will find you attractive or not at this point, you being obvious about wanting him to notice you, so long as you aren't being annoying, probably won't sway his interest any way but positively. When you see him looking at you just smile and wave, say hi. So he knows you are open to talking and friendly. If he is interested then he'll probably come over or buy you a drink. Why don't you want to approach him though?
Most Helpful Girl
Well I'm 15 so what do I know? But I'm guessing don't twirl your hair, giggle, or cross your legs in his direction - you know the kinds of things younger girls usually do to get guys attention. I would make eye contact with him and smile just a little bit, not really seductively. I think you'd get his attention and also seem more mature