It really depends, but mostly good to excellent. Quite a few kids of mine bosses, and they tend to be well traveled and mind blowingly wealthy families, some actual billionaires and a lot of millionaires. Then there are the kids of parents who own a business such as a restaurant, bar or hotel- much better behaved children, but they struggle to support them with their English.
Todays other moan is that the online grading is all in Mongolian- getting a headache from Cyrillic, which as been pleasantly easy to pick up compared to Thai/Myanmar- speaking Mongolian is a different matter.
Oh and last year Steven Segall sent his kid here- than man was apparently very strange but easy to get on with. His wife by all accounts was lovely, as was there well mannered son