About IQ scores... well usually we got our scores by doing tests of traditional questions. You know, HK people on average train themselves doing similar types of questions too much. So if someone tells me that the average IQ score of HK people is the highest, it's not surprising at all. But it doesn't mean HK people are really the cleverest.
And there are so many things controversial about the "IQ score". For me, it's just like something fun / funny for casually chatting with others. Hey man. Don't trust the scores too much.