Needs more time, I couldn't manage it on the first go but I can ace the countries of the world quiz in 8 minutes. I'm curious however on Australia, USA the UK? surely they are English speaking countries?
UK is listed as an answer, it was added after I looked into it again. As far as Eswatini, it was still Swaziland as that was the name of the country when this quiz was created. The name has now been updated to reflect the recent name change.
I know that the USA has no official language, but is that also true for the UK? Kind of funny, if so, that the UK wouldn't have English as the official language yet Ireland would. And so would most of the countries that were formerly British colonies which is what the majority of this list is. (plus a couple, like the Philippines, that were formerly American territories, and then a couple odd one-offs)