More likely, the smartest students in each country work on things that have landed older students good jobs. In US, that means preparing for interviews at big t

More likely, the smartest students in each country work on things that have landed older students good jobs. In US, that means preparing for interviews at big tech companies. In Russia and India, it means something different. Averages in a country don't really say much about the smartest students in that country anyway. It seems likely that the smartest students in China, India and the US are similarly gifted. If you look at the average high school student in the US, you might conclude that Americans are pretty stupid, but the averages are brought down by the obscene amount of educational inequality in the US. American CS students aren't so affected by this because they mostly come from the "good" schools.