When I received my diploma from Bronx Science High School in 2010, I was one of the few Hispanic graduates on the stage. But my fellow students and alumni were united by a deep respect for our common accomplishment—which is now in jeopardy.

Mayor Bill de Blasio and Schools Chancellor Richard Carranza have proposed to abolish the Specialized High Schools Admission Test, the qualifying exam for Bronx Science and New York City’s eight other specialized high schools. In the name of “diversity,” they propose a lottery open to the...