NEW YORK (AP) — City Comptroller John Liu has flunked the New York City Department of Education’s high school grading system.

Liu charged in a new audit Sunday that education officials have revised the complex formula used to grade schools every year, which makes it difficult to get a true picture of a school’s yearly progress.

Liu says the system used to decide school closings “leaves teachers and students confused about what they need to improve.”

The audit focused on 10 schools representing the five boroughs.

In a statement to the New York Post, the Department of Education said progress reports are “a one-year snapshot that is designed to compare schools based on their performance and progress during that school year.”

(Copyright 2011 by The Associated Press. All Rights Reserved.)

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