Hi! I am an exchange student from China. I would be glad to teach you some Chinese or English. Preparing for a phd position in America, I have finished a TOEFL (109) and a GRE (326+4.0) with only one try. So yes, I would say that I am good at English, not as native but definitely know more about how to learn English as a second language.
I hope we can have some chat about the opportunity, and change of salary can be a part of the discussion. Thank you for your time!