He was abducted by Hagrid when he turned 11 so that would place him maybe around the fifth or sixth grade.
I don’t know if canonically there are math classes at Hogwarts.
The thought came to while I was watching the anime Mashle. If you are into Harry Potter and One-Punch Man I’d recommend giving it a watch.
Someone mentioned this community below; I wanted to highlight it.
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Hello,
You can see some initiatives that take the books away from her, such as this one
https://www.glamour.com/story/a-complete-breakdown-of-the-jk-rowling-transgender-comments-controversy
A link to the version from this person, they look quite nice: https://laurflom.format.com/harry-potter-rebind
You mentioned legislation, I think that is an interesting point. If the books (and the HP universe in general) are so detrimental, shouldn’t they be condemned by countries court for xenophobia and transphobia? It seems strange to me that there are still 2 major amusement parks Harry Potter themed in the US, and a third one in London if you count the former shooting set, with thousands of visitors every year. That just seems so strange compared to the accusations the books face.