The W3C Data on the Web Best Practices don’t address the interoperability and comparability points raised above. Approaches to making your data interoperable and comparable would be an interesting topic to discuss.
The Intended Outcome of the “Provide data quality information” best practice is,
Humans and software agents will be able to assess the quality and therefore suitability of a dataset for their application.
So I guess the data quality information for the points above could be:
Knowing that information would help you determine, without downloading and inspecting the data, that the data is not suitable for your purpose .
There are many data quality dimensions that can be described, some more practical than others.
edit: As an aside, I found the list of all schools via https://schoolsdirectory.eq.edu.au/# and I’m told an API is coming soon.