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The proportional breakdown of school grades remained mostly stable for the 2012-13 school year compared to previous years. According to data released by the Department of Education on Wednesday, more than 60 percent of the city's public schools received A's or B's on their annual progress reports; 9 percent of schools received D's or F's. 

Charter schools and new high schools outperformed other schools, with 69 percent of charters receiving A's or B's.

The more notable changes were in the college readiness category. This year, 31.4 percent of students who entered high school four years ago had the grades needed to be considered ready for college, a gain of nearly 3 percentage points since last year. This figure climbed to 46.8 percent when only including students who graduated versus 43.6 percent last year. 

High school report cards already take into account these college readiness figures. But this year, for the first time, they also included a measure of what the city called "persistence," or the ability to stay college. A total of 48 percent of students who entered high school six years ago have either graduated, demonstrated college readiness or have enrolled in college for three consecutive semesters.

This means that among students who were supposed to graduate in 2011, there are many who stayed in college even though the city didn't think their grades were strong enough. Schools that did well on this factor were rewarded extra points.