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The colloquial "Asian" means East Asian/Far Eastern.

This includes Japanese, Chinese, both Koreans, Taiwanese, and Mongolians. Commonly, anyone with epicanthic folds.

In this case, I don't think the OP was talking about biological differences. It's widely known that the aforementioned cultures (especially Japan and China) are very big on having their careers and studies at the center of their lives.

In this case, it would be nurture giving these groups an advantage over their Western counterparts. Who, ignoring the top-tiers, on average are not known for their industry.

There are selection effects in place when immigration enters the picture.

You just need different relative reproduction rates or different levels of assortative mating. For example, the Khmer Rouge may have affected Cambodia's IQ distribution (negatively) but Cambodians don't now have "biological differences" per se.