Quite right they are not and that is my point. Usually (at least in the Chinese case) their spoken English is far superior to their written English. I will not dwell on the why.
For International student enrollments I don’t think it is simply a case of hand in the application, the supporting essays and a cheque. I have to presume that the documents will get you an interview with the enrollment officer. That the decision to enrol is based solely on documentation seems absurd. No checks and balances. In any case the supervised essays I referred to would come after enrollment - that is when a student becomes undone.
I assure you that it is often glaringly obvious. When you see sentences that have been produced by anyone who has a facility for grammar, spelling and ordered thought and compare it to the word salad that the applicant regularly produces you cannot for a minute believe they are from the pen of the same person. Supervised essays prevent students from gaming the system and sort the functionally literate from the barely literate.