2 weeks in and ds and I have had our first major bust up. I check his planner every day and ask him about homework.
Just found out this morning that he had a piece due in today. He's just spent 20 mins rushing it, which IMO is not good enough by year 9.
He knows that the consequences of this is we take his x box away, this time I told him it will be until the weekend, so that he learns that homework comes first.
At this point he lost the plot and called me an arse 
I'm going to speak to dh tonight, but what do you do about behaviour like this? It's not the first time, I don't know how to get through to the little toad, his gcses are going to be disastrous if he carries on like this. 