I did 15, and got 3 points. There were some countries in there that I've never heard of.
I can't remember ever being interested in geography, at least as far as country lines were concerned. When I was much younger, I preferred elevation maps, without all the damn useless lines everywhere. They were just country borders, which I saw as kind of superficial boundaries - they were all filled with "people," right? The borders didn't matter much to me.
Edit: ok, so apparently I didn't know how to read the score - I was looking at the points per question, and totally didn't see the gray boxes there that kept track of it.
Final score: 48. Part of it was like a game of Memory - "Ok, I remember seeing that name before, where was it....."
I've not heard of quite a few of them.