I am a native Chinese citizen with moderately good English communication skills. The main purpose of my coming here is to give language usage tips based on my living experiences in mainland China. I hope to provide help from a perspective different from your (foreign) textbooks and courses, and whatever I answer may tend to be more easily understandable.
I prefer Simplified Chinese (mainland) over Tradition Chinese (Hong Kong, Macau and Taiwan). Despite that, I have a good knowledge about Traditional, too.
I will try to answer your questions in English for better understanding, but I will also answer in full Chinese sometimes. Please don't blame me if I has accidentally wrote a wrong English sentence or a typos.
I don't know anything about language ranking examinations/tests, nor do I need to. I do have knowledge about ancient Chinese and traditional cultures, though.