A school you feel comfortable at can make an enormous difference. If someone asks me how school is going or how I like it, I always start smiling (more like shining). The school I attend now is adult high school, although my oldest classmate is 23 or something I think. (There are also evening classes; most 'real' adults go there) Basically allowing people to get their high school diploma in a different level/subject, or get it anyway after not finishing, or get it after failing one or two final exams in high school.

They are a lot about 'your own responsibility' which is very liberating and stress-reducing. If I haven't finished my homework (because I was having panic attacks all evening or another 'valid' reason) and the teacher asks, I say 'no' and they move on, because doing homework is my own responsibility. If they do asks, it's because of concern: are you unwell? or: Was the material (too) difficult?
Also, this is the first normal school where I haven't been bullied. I have never seen anyone else get bullied, either.
They are rather strict on that: you are there because you want to be there, so you behave. If you're disturbing the class, you're offered to 'shut up' or leave the room (sometimes first a few warnings to make less noise. And they don't actually use the words 'shut up'.) No punishment, just don't be there if you can't behave.
Only punishments are being kicked out or not being allowed to do the test (meaning you can't graduate). There are very few rules and a very clear line - crossing it does have consequences.
I like to phrase it like this: you can sleep in class, as long as you don't snore. :-) (And yes, I've done so. Started new meds during the summer and was literally falling asleep everywhere, or so tired I couldn't concentrate. If you're falling asleep because of a hangover, they might wake you up and call you in for a meeting if it happens more than once.)

It basically comes down to two things here at school: TRUST and ACCEPTANCE. The school and its teachers trust that you do what you can and perform to the best of your abilities. And they accept that sometimes that means not finishing homework, having a bad grade on a test, or falling asleep in class.

It's amazing.