The feudal system in China from thousands of years ago is still used in schools today:

The etiquette system of the Zhou Dynasty: No drinking water during class, even if thirsty, must endure; conduct must be proper, or it’s considered disrespectful to the teacher.
The harsh laws of the Qin Dynasty: No fighting back in school fights; all decisions are made by the teacher, private resolutions are strictly forbidden, even in cases of legitimate self-defense.
The closed-door policy of the Qing Dynasty: Boarding schools where parents are not allowed to freely send items into the campus; strict control of internal and external communication.
The literary inquisition of the Qing Dynasty: Students are not allowed to post videos or comments online to prevent “impact on the school’s image.”
Imperial prohibitions on extravagance through the ages: Students are not allowed to eat snacks at school; advocating simplicity and uniformity, banning “hedonism.”
Confucian moral education system: Running morning exercises while reciting ancient poems, promoting moral education and physical fitness simultaneously.
The Qin Dynasty’s book-burning policy: Schools designate certain extracurricular books as “forbidden items,” even classics cannot be brought in.
The Qin Dynasty’s collective responsibility system: Because of certain classmates, the entire class is dismissed 15 minutes late after school.
The Han Dynasty’s “Eleven Strikes and Kill” order: Your group votes to select the least honest student.
The Song Dynasty’s Baojia system: Next Monday’s quiz on recitation, wrong one sentence and the whole class copies it ten times; wrong two sentences and the entire group copies together.
The Sui and Tang Dynasties’ imperial examination system: The class ranking in the final exam will determine who your next semester’s desk partner is.
The Tang Dynasty’s Fubing system: Tomorrow, the school organizes snow shoveling; everyone remember to bring an iron shovel.
The Wei, Jin, and Northern and Southern Dynasties’ Nine-rank system: The list of impoverished students this time, organized by the class monitor, to be handed to me before school ends.