He-he … it was fun, and interesting. I got same result as you, while I, too, am not native English speaker. I do not like, though, how the test results are presented – because it does not give you your own percentage of correct answers!

My mothers tongue is Croatian, and our alphabet “misses” few letters (w, y and x) out of which I most commonly run in trouble with “v” vs. “w” especially in pronunciation.

In writing, I’m guilty of double lettering unnecessarily as well as dropping some double letters – can anyone really explain to me why are you English so fond of duplicating your letters?

As for the test results, like with so many other “handicaps” I believe that people work much harder on the second language, and I know that I had much more extensive grammar in school when I was learning English than my child has here with English for his first language. That, IMO, does account for … something