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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I don’t remember where the books said it, but I remember them saying that they go to school before hogwarts the way that we go to school there just isn’t magic. Harry and Hermoine talked about going to school.
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