If you want to know why the number of Asian students at Stuyvesant High School keeps growing (it's nearly 72% of the total this year), just head over to Khan's Tutorial in Jackson Heights on any weekend this month.

There, you will find two floors of classrooms filled with students, nearly all Bangladeshi Americans. More than 100 of them. Some are taking group lectures. Others are receiving individualized tutoring. Nearly all are eighth-graders with a single goal: getting into the city's top and most selective public high schools....