I don't want to really help my friend in class
Is there a reason to not want to help him?
He's a pain in the ass and I don't care about him at all
You don't have to do everything for him. But you should be a good friend and help him out when he needs it.
Friendship is overrated.
You say friendship is overrated and yet you called him your "friend". I think if you help him it will be a kind gesture and you'll feel proud.