New York City school officials say the high school class of 2013 showed a 3 percent improvement in college readiness over the previous year.
College readiness factored into progress reports for 1,624 city public schools released Wednesday.
Mayor Michael Bloomberg's administration began issuing the A-through-F grades to schools in 2007.
The grades for the 2012-2013 school year will likely be the last. Mayor-elect Bill de Blasio has called the letter-grade format too simplistic.
Out of all the schools that received grades, 27 percent got an A.
Thirty-six percent got a B and 28 percent got a C.
Six percent got a D and 3 percent got an F.
The college-readiness index is one of the factors used to grade high schools.