Hey man, I'm also still in high school so I know the situation there.
So what I know about high school is it's all about social proof and fun. Don't rely too much on poetry or stuff, just add her to your social circle, hang out with her for a while, build sexual tension while you're hanging out with her and your friends, but don't only focus on her because it'll be clear that you're hitting on her, and if she's uncomfortable about that, it'll be a little bit harder (something that u don't want, right?). But the game works in high school, because not many people uses qualification stuff, it makes you stand out from the crowd, it's just high school game is more into social proof and fun.
Maybe this doesn't help that much, but at least I can give you the key to high school game (credit to Psych)
For me, I rely on my sense of humour and situational opener to open the girls in my school, and I'm still learning HS game, so I can't really help much but to cheer you up.
Hope this helps,
Best pal,
Steven
