Why is a classroom a miniature of a greater society?

The teacher or professor plays the role of the leader/monarch, while the students are the citizens. The citizens are suposed to follow the rules and laws of the society (class) that the leaders (teachers) set.

In every classroom, there are different kinds of people: Those who work hard, those who play hard, those who do both, those who do neither. In society, you also get these kinds of people. There will also probably be little cliques, in this case, representative of small groups in society.

Then there are the high class, those who fly past everything without hitches, the middle class who get by, and the lower class who are really struggling to keep up with the coursework. The teacher may offer remedial sessions, which can be compared to any welfare packages that the government decides to hand out.