Those students are usually amazing in terms of good will (much stronger than most Western students).

The first time I lectured at the ASP school was a complicated experience for me. I was supposed to provide an introduction to quantum mechanics, special relativity, gauge theories and quantum field theory. On slide 1, I have a question about the Greek letters (one of the student didn't know what the letter 'mu' was). Then later on, another student started to ask a lot of very deep question on quantum disentanglement.

Such a gap in levels makes teaching really tough!