Poor lad. I do agree that the system needs an overhaul and parents really need to be 100% up for it.
When oldest DS was in P1 there was a child who joined their class who had been adopted by a local couple. To say he was "troubled" was an understatement. He was one of those kids you read about in the newspaper, utterly neglected and removed by force from his parents, emergency foster care, longer term foster care, adoption. He was violent, foul-mouthed and a very very sad and angry little boy. His adoptive parents are an older, professional couple, probably early-mid 40s when they adopted him. They both went part-time at work and spent so much time and invested so much effort in their child. Improvement was slow. DS and the boy were together in beavers and cubs, the dad attended every single meeting to make sure he could step in if needed. Every school trip. Every after school activity, he had a parent there. In P7 when the kids did their residential there were still a few concerns so again, the Dad gave up a week of his own time to accompany his son so he didn't miss out.
Anyway, long story short, the boys are now grown and left school, both at Uni and the turnaround those two parents achieved is remarkable.
I don't think either of them would say it was easy, but they gave it their all and they've done a fab job on him. He's polite, well-mannered, happy and enjoying Uni.