Most of my extended family is Chinese-born. This cohort (educated, upper middle class and above) definitely raises better test-takers. They are statistically much less likely to divorce and much less likely to be on public assistance. I value these traits enormously myself.

It is not clear to me they are better children. Personal anecdata shows that many of these kids were raised with such obsessive concern with getting into Ivy League colleges that they are not complete adults, and often don't know what to do with their lives when they graduate.