My ds is at a selective secondary and is meant to have an hours homework a night, however he often says he has nothing, and when he does, he only spends 10-15 mins on it. The school say he needs to put more effort in , but he seems to think he's fine. He gets cross if I nag him, but I'm worried he isn't achieving what he could, or realising what's involved. Any thoughts on how to help him ? I don't want to keep falling out with him.