Cassi / Sadji
I haven't the context to make proper sense of that, I'm afraid. I know that mathematics is an attempt to make sense of arithmancy by those who haven't the magical knowledge to grasp it properly. There have always been cases of academic overpressure in school. I know several people who were sent home for a term or so to recover from it. Usually very talented but from - well, I suppose you would say disadvantaged backgrounds, so they want to make the most of their education. There have always been bullies. It's very unfortunate, but it isn't new.
If you don't care to discuss it we might simply agree to disagree, though.
'I'm hurting so I will hurt you' is the sort of thing I would find quite unremarkable in a child of six, but very worrying at sixteen. And really, aren't all those things you listed the fault of the parents anyway - they are causing the abuse, or exerting the pressure?