Good Finish children

Do you know about "PISA"? It stands for Programme for International Student Assessment. It seems to be survey on abilities of children (15 years old) in the world. (I wonder people usually don't call 15 years old boys and girls "children".)

I found one article that mentions why Finish children's abilities were high. Following is the result in 2003.

Ranking	Mathematical literacy	Reading comprehension	Scientific literacy	Problem-solving abilities
1	Hong Kong	Finland	Finland	South Korea
2	Finland	South Korea	Japan	Hong Kong
3	South Korea	Canada	Hong Kong	Finland
4	Netherlands	Australia	South Korea	Japan
5	Liechtenstein	Liechtenstein	Liechtenstein	New Zealand
6	Japan	New Zealand	Australia	Macau
7	Canada	Ireland	Macau	Australia
8	Belgium	Sweden	Netherlands	Liechtenstein
9	Macau	Netherlands	Czech	Canada
10	Switzerland	Hong Kong	New Zealand	Belgium
11	Australia	Belgium	Canada	Switzerland
12	New Zealand	Norway	Switzerland	Netherlands
13	Czech	Switzerland	France	France
14	Iceland	Japan	Belgium	Denmark
15	Denmark	Macau	Sweden	Czech

Hmmm... as the article said, Finish children are excellent. Didn't Japanese children also get good result? Other Asian countries, such as Hong Kong, South Korea, Macau, are also good. Liechtenstein got good result but I heard Liechtenstein for the first time. (I'm sorry, Liechtensteinian) So I checked this country. It's very very small country. Marquis governs the country! and it is absolute monarchy. Switzerland acts for Liechtenstein's diplomacy and there is no passport control between Switzerland and Liechtenstein and they can freely travel back and forth between the two countries. Liechtenstein is a permanent neutral country same Switzerland. That's all I know about Liechtenstein.

The U.S. never placed any sections. THOUGHT AS MUCH. Is the present situation that the US is leader in the world OK? I often wrote that there could be no peace on earth as long as the U.S. is leader of the world. (ref. my article 1, my article 2)
I wonder which country is appropriate for the leader in the world. Oh, there isn't name of the U.K. in the ranking too. Oh, German too, and...