There's one where there are a bunch of outcast teenagers in a school who take classes in a shed back behind the school, there's the geek, asian foreigner girl who barely speaks english till the end, and the "bad boy" who has a crush on her and is the only one who can understand what she's actually saying, and a few more I don't remember. And I remember something about them making a school parade float that wins the competition at the end or something to that extent. It's not too old. Made around in early to mid 2000's or so.

This sounds like dumb and dumberer, the prequel to dumb and dumber