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 figured it might’ve actually been addressed properly, but I couldn’t resist bringing up how she tweeted about wizards and witches magic-ing away their poop.
Writing that also made me realize that there are only two genders for magic users in her world which is not surprising of course lol