Tehehe, I cheated with this ...not really:
DISCLAIMER: Don't watch if you do not want to cheat!
Without cheating, I got 35/47 on the Europe one (I forgot about all those extremely tiny countries you can't see on the map.
22/23 for North America (it was retarded that they put islands together...I didn't know that until like, the last ten seconds).
12/12 for South America
47/53 for Africa
47/48 for Asia (wtf is Timor Leste....I've never heard of that before)
14/14 for Oceania woot!