Uhm, this isn't an Asian thing. It's an immigrant thing.
Asians get most of the media attention but Nigerians, Kenyans, Ghanians, etc. all have similar education outcomes as Asians. The difference is that their statistics get lost in the much larger native born African American stats (since 91% of the black population is native born) while Asian immigrants represent 75% of the Asian population.
For example - 1/3 of Harvard's black student population is made up of immigrants/first generation Americans but they represent less than10% of the total black population. Why the disproportionate presence of immigrant black kids compared to natives? Immigrant parenting is better than native in all ethnic groups.
My brother hears the same complaints at his daughter's school and they live in a mostly white suburb. He parents the way immigrant parents do, which means he's on top of everything. He gives extra homework, supervises everything, and limits who she can have as friends and what activities she's allowed to pursue. The results are that she's the most accomplished child the school's ever had, winning so many awards that the school doesn't know what to do.
But what do the other local parents say to him? They ask him to join them in a campaign to reduce the amount of homework that the school assigns. She gets perfect scores on all of those state standardized exams and rather than copying his approach, the other parents want their kids to study less.
Anyhoo, my point is that this isn't an anti-Asian thing. It's a general American trend towards to less meritocratic educational standards that's contrary to the immigrant work ethic. It simply shows up more heavily in the Asian population because they, unlike most other ethnic groups, don't have a large enough native population to bury the immigrant specific statistics.