Hehe. I got 11/15. I'm not a native English speaker. English is my second language.
Ask Harnquist to take this test. I bet he can't answer a thing. "I'm sorry tabei but I did not understand that clearly. Can you please rephrase?"
I think what matters more is if you are able to express your ideas clearly, notwithstanding the grammar or even sentence structure. For example, I don't mind if Harnquist says "I can has steel" or "I got steel". For me both are same

However, it'd be great to see multilingual PS releases, there was already a thread about it somewhere.