I know this is irrelevant to the argument, but it is illustrative of what schools are up against.
I used to teach a really troublesome/spirited pair aged 14 and 15, whose 29 year old mother worked in the school kitchen. In my first year, I was carrying out GCSE orals in French in a hut round the back of the school, behind the kitchens. Young Brian was supposed to be one of the candidates. At the appointed time, I was set up in the hut, waiting for young Brian. Nothing.
Next candidate turns up, is duly done, and leaves. Suddenly, I spy young Brian on his bicycle heading up the school drive. By the time I reach the hut door, he has dismounted and is lighting up a cigarette with his mum at the kitchen door.
I go out to tell him he can come in. He says: "Na, it's OK, I don't think I'll bother." and cycles off. I speak to Donna, who says: "Well, I'll speak to him, but I don't think he wants to do it."
Sound of my jaw hitting ground.
Brian never did his oral, and predictably failed his GCSE.
Five years of learning French, wasted in a moment, in agreement with his mum.
Brian was by no means unusual (think 12-15 in every class of 27) in this attitude to learning and exams, in a state school in a well to do town in Surrey. Whilst I am quite certain he was probably embarrassed and not wanting to show himself, he was also wrecking his chances of anything other than labouring jobs and low pay, possibly for life.
My question is, how much learning do you imagine was going on in those lessons with such involved and interested pupils? That's right, not much. Chaos barely contained just about describes it.