A lot of these actually seem to be British. We don’t refer to kids as Year so-and-so (ie, Year 7), and what’s primary school to the Brits is elementary school to Americans. Not to mention all the mentions of school uniforms, they’re not that popular here. And we don’t have Headteachers, we have Principals.
That’s not to say we don’t have our own crazy rules, but the majority of this particular crazy seems to be of British/UK nature. Though it does sound like 1, and 19 are from the good ole US of A.