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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He came from muggle land, so he is probably aware of guns. He could probably easily made his skin bullet proof with some spell. It’s not like wizards can’t invent new spells and magic. They just almost always seem to choose not to. I think the vast majority of wizards are lazy hacks.
I also think it’s just supposed to be hard to make new magic and the spells that are common were built to be common.
For example, it is possible for anyone to write a new program for their phone. How many people actually can or do? How many people, with some training, can use most of not all of the programs that others have built to be productive.
How hard can it be? The Weasleys are all adept at it. The mother showcases spells and items never seen before or again in the story. The father turns muggle objects into working magical objects, the most famous being the car that can fly. The twins create three stories worth of magical objects for their store.
Maybe your right and the Weasleys, Snape and Voldemort are some of the most intelligent wizards.
I mean… According to the story… Yes?
The entire Weasley clan is shown to have a depth and breadth of magical understanding that the average wizard doesn’t. They are critical players in the organization that defeats Voldemort and they rub elbows with the most famous and politically powerful wizards on a regular basis.