It's likely someone in Ostania spurring again their mental control shenanigans. They probably went into hiding when the government collapsed after the war, and want to control the country from the shadows.
I assume it's probably at least a class that was not based on test results. It is stated that students remain in their halls for classes not based under the previous term's test results.
Also, who excused Yor to take a day off from city hall? Presumably, Shopkeeper excused her because of the poaching hunt's failure?