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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It is but I’m not sure why they called the author a witch instead of a shitty author. For whatever stupid detail you find, the writing is 5x more awkward
Even a dragon would make more sense because of the wealth hoarding