That means they have got to prepare and pass certain language tests qualifying them for enrollment in a foreign uni abroad.

And that means the university should pay you at least 6,000 RMB/month for 18 classes/week. But being kinda lazy, I would reject such a post - I prefer teaching oral English for at most 18 classes/week. Teaching standard everyday English mixed with a bit of humour, for at least 4,500 RMB/month, suits me just fine. No stress and no marking! Plenty of free time, too.