I'm literate enough to read the entertainment section of a newspaper, and get a perfect score on the SAT 2 Chinese language test in the US. Technically, I wouldn't really be considered literate for an adult though.

When I came to the US at 4.5 years old, my mom brought with us some textbooks, enough for kindergarten through 3rd grade. I'm mostly self taught with help from my mom.

I more or less speak like an adult, but if I'm asked to read anything more complex (e.g., bank documents, geopolitics news), I'm completely lost.

Interesting. I can never imagine a grading system for chinese as a native speaker so got intrigued. Having done language tests for English when I was a student but can't imagine the other way around. Will look up for more. Thanks