Stay cool. don't curse in front of her. Don't laugh at mistakes she does. Ask a parent if you can go to the movies with her or with her and a group. Before you do all this make sure no one in the class knows you like this girl.
i think that if u like a girl who is yunger than u, by all means, go out with her. but i woodn't tel any of ur frends about it, b cuz they wood probably make fun of u. but the girl wood prbably b...