New York City public schools include eight high schools that admit students on the basis of a single score, a rigorous test that all applicants musty take. That requirement is set in state law.

Mayor de Blasio wants to increase diversity by scrapping the single test.

The de Blasio administration wants to increase diversity at the schools, which are dominated by white and Asian students, and small numbers of Black and Hispanic students.

“The city’s specialized high schools — considered some of the crown jewels of New York City’s education system — accept students based on a single test score. Over the last decade, they have come under fire for offering admissions to few students of color: While two-thirds of city students are black or Hispanic, only about 10 percent of admissions offers to those schools go to black or Hispanic students…

“Right now, we are living with monumental injustice. The prestigious high schools make 5,000 admissions offers to incoming ninth-graders. Yet, this year just 172 black students and 298 Latino students received offers. This happened in a city where two out of every three eighth-graders in our public schools are Latino or black.

“There’s also a geographic problem. There are almost 600 middle schools citywide. Yet, half the students admitted to the specialized high schools last year came from just 21 of those schools. For a perfect illustration of disparity: Just 14 percent of students at Bronx Science come from the Bronx.”

In the past, efforts to change the admissions requirements of these specialized high schools have been blocked by the Legislature, which includes a number of graduates of the specialized schools.

Chalkbeat summarized the specifics of the mayor’s plan:

“De Blasio’s solution, laid out in an op-ed in Chalkbeat, would set aside 20 percent of the seats at the eight schools for students from low-income families starting next school year. Students who just missed the test score cut-off would be able to earn one of those set-aside seats through the longstanding “Discovery” program. Just 4 percent of seats were offered through that program in 2017.

“The mayor also said he plans to push state lawmakers to change a law that requires admission at three of the schools to be decided by a single test score. That’s something de Blasio campaigned for during his run for mayor in 2014 but hasn’t made a priority since.

“Most significantly, de Blasio says for the first time that he backs a system of replacing the admissions test with a system that picks students based on their middle school class rank and state test scores. The middle-school rank component is especially notable, as an NYU Steinhardt report found that the only way to really change the makeup of the elite high schools would be to guarantee admission to the top 10 percent of students at every middle school.

“If all of these changes were implemented, de Blasio says that 45 percent of the student bodies at the eight high schools would be black or Latino.”