The top performer attributes are also interesting, the majority of Asian immigrants come to the US with a technical job, resulting in children who tend to succeed in similar subjects and overall, as their parents are an easy role model, and are relatively well off.

This, of course, can be attributed to things like the Chinese Exclusion Act, etc., which made it extraordinarily hard to immigrate to the US from Asian countries, so only well-off and educated individuals could get here.