[kwdc]

I'd also say that a school denying access to this information should rightly expect pointy and sharp questions coming at them. Parents being part of the education system shouldn't come as a surprise to a school. It would be like hiding the school timetable.

Usual common sense caveats still apply: Privacy and authentication are still valid aspects but not to block those who could reasonably expect to successfully authenticate, eg a parent of a kid in school.