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 would expect Voldemort to have protective spells keeping things like that from happening.
If it were that easy to kill a witch or wizzard… then there’s lots of ways to go about that. He wouldn’t have needed a special wand to fight Harry. he’d just fling a ginormous rock out of nowhere.