Well, it is very common in situations like this to have 2 to 4 assistants, and I can't believe without them it would be possible to avoid hard conflicts and even violence on regular basis.
Faculty at colleges get teaching assistants, but their job is hardly to help with conflicts or prevent violence, their job is to help with instruction, grading, writing homework assignments, etc. When I was a teaching assistant, I myself tended to have 10-20 students in my section, and the class as a whole had close to a hundred people.
I'm most familiar with China (I taught middle-school classrooms of 55-60 in Yunnan around 2010, and had some friends in Guangzhou teaching 75-80), but I assume there have been & are plenty of countries with similar situations.