What does it mean to sit in the classroom in prison?

Duty work is a "criminal supervision post", which was also called "maintenance worker" in the past. Generally speaking, it refers to assisting police officers to carry out supervision and discipline supervision in designated areas (reporting criminals' violations to police officers immediately), or being on duty on the floors and corridors of prisons at night (reporting findings). Class assignments require good performance or short sentences. At present, the prison requires police officers to manage directly, and the requirements for sitting are very strict.