I'd say it depends what form your "loss of temper" took.
My DS is 12 yo and I've posted on here about how much help/supervision he should have.
The general opinion is none. If he doesn't do the work, then the school teachers will mark him accordingly.
Well, I know my son. I know he is clever but bone bloody idle. If it's a subject he likes then he'll happily do the work. If he doesn't (and TBH we've all got to do things we don't like) then it's a struggle to motivate him, and left to his own devices ,he'd just hand in any old rubbish, the bare minimum.
I get him to think about the question, plan his answer, do a rough draft, then the finished work. Then hopefully, this will be the way he'll approach his homework without me guiding him.I don't intend to be doing this forever.And I always tell him it's his homework, he has to understand it, in his words.
The only exams he's done so far is his SATs. He was expected to get a 5 for maths, he got a 4 in everything, fair enough, a good mark, and he was happy.But if he'd pushed himself he could have done better.
So I can see where you are coming from George.. I think they are at school a relatively short time. It's going to affect the rest of their careers, the marks they get. Maybe this is a shock for him, to not do well.
I just don't want my DS to turn round in years to come and say "You should've made me work harder"
He's 12 yo A child. I'm the adult.I'm the parent.