Washington, D.C., students sat for three times as many Advanced Placement exams in 2008 as in 1998, but earned passing grades on less than 10% of the tests. After discovering that one of D.C.'s worst high schools would have ranked in the top 5 nationally in the number of AP
exams taken after students took 750 exams but passed just 2% of them, Washington Post columnist Jay Mathews amended his high-school rating system based on AP exam participation.

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