and if on the 30th attempt you d still only get 12 right i think there might be some memory issue, no obscure answers here so the ones you missed the first time you could easily remember the 2nd try.
There is nothing weird about that. The quiz was quite easy, I was silly to forget canada, but other than that the only one I didnt guess was jamaica (maybe If I had more time, cause was allready thinking about, what is the biggest place where they speak english)
And Luxembourg? 2012 statistics has 52% native Luxembourgish and 2% native German, plus an unknown percentage of English.
Also, shouldn't Ghana be on the list too? https://en.wikipedia.org/wiki/Ghanaian_English