[@HumanMusic]

That's a good start, but it could use some refinement. As for the "same class or group", the answer would be a bit more confusing. Mages, warriors, and "thieves" would logically have some different classes at times, but they could be part of the same overall social group. Also keep in mind that boys and girls have different dorms. 

Here's a version of the rules. I found a good "parchment" background for it:
[img]https://orig00.deviantart.net/3319/f/2017/260/5/4/arcane_orphanage_rules_1_by_aristodes-dbnqwzk.jpg[/img]