For the first time, Asians will be the largest group entering Thomas Jefferson High School for Science and Technology in Fairfax County, according to the Washington Post.  It’s not just TJ, either.  The article goes on to say that,

The rising concentration of Asian Americans at T.J. mirrors demographic trends in other elite math and science magnet schools. In New York, the selective and specialized Stuyvesant High School, Bronx High School of Science and Brooklyn Technical High School have Asian American majorities, although about 10 percent of the metropolitan population is of Asian descent. In San Francisco, Asian Americans make up more than 60 percent of the students at selective Lowell High School and about a third of the city’s population.

Asians make up less than 10% of the residents in the Washington area, so why are they so overrepresented at the highest end of the educational spectrum?  Are they innately more intelligent?  There is little evidence to support that.  It is possible that selection for intelligence has occurred in China, so the more intelligent have more children, but there is no evidence for that either.  However, there is evidence of a cultural difference:

The success of Asian American students reflects the educational commitment found in many immigrant communities, particularly for second-generation students fluent in English and encouraged by upwardly mobile parents who came to the United States for higher education or professional positions.

Yes, I think culture is more likely to explain the differences in racial disparities in education and achievement.