You need to bear in mind if your child has difficulties that teachers are not always informed by the school about kids' problems, plans or not. You say all the teachers know. How are you so sure of that?
And you also need to bear in mind that teachers are human, too.
I used to be one, though I taught 16+ . The way things are now, I wouldn't consider the job in a school no matter what you paid me. You're expected to be a teacher and get good academic results, which is a tough job in itself and to my mind should be all a teacher should do- plus spend most of your time outside school doing paperwork even in holiday time, be a police officer, a social worker, a psychologist, a counsellor, (all of which should be qualified specialists, not teachers), a leader in out of school activities for no extra pay, take all the crap parents throw at you when an idle kid or just one that is a good kid but not good at the subject isn't achieving, bring their kids up properly to tell the truth, socialise, and behave decently when parents often can't be bothered to, put up with actual violence from kids and parents, and cope with 30 at a time when most parents, with far more sanctions available, can often not cope with just one. And you must, according to modern ideas, never once speak unkindly to any of them. Sod that for a lark. There aren't enough saints with boundless energy and totally unassailable good physical and mental health to go round to staff schools with people who can do all that.
Of course it's reasonable to try to help kids who are struggling, and many teachers are positively heroic in doing so however knackered they are, but this needs to come with a warning- if accommodating kids problems goes too far, it prepares kids very badly for the world outside, and the world of work.