Well clearly Ты need to день dream about something else,maybe something easy to get.Like think about пицца for example,and then fantasize about the domino's пицца you're going to order when Ты get home.And then with that thought Ты go back to focusing on class,it's real easy man.
I've never been in Любовь (Ew Любовь get it off! XD) but I know how hard it is to do something else when your really focused on something else. If your anything like me, I say the only thing Ты can do is go after her and get an answer yourself или you'll always have regrets.
Get addicted to a YouTuber who makes at least some Музыка videos. (Tobuscus, Smosh, CaptainSparklez, etc...) Spend a few hours watching a bunch of their videos, finishing off with the Музыка so it gets stuck in your head.