Which class shoud I be in?

I am wondering now... I am in the level6, and I was satisfied to be there. But recently I sometimes feel boring and annoyed with one of classmate. He doesn't concentrate in the class at all, when we had a task that we had to do, he just ask me to give him correct answers. I talked about it with some of my friends, they suggested to me that I should ask teacher to move me up to level7. But I know my quality is not good enough to move up to the class... My friend said to me that even if I am not good enough I should challenge to move up. I am not sure what I should do now...