COLUMBUS, Ohio (AP): New state report card data shows fewer Ohio districts receiving an “A” grade on a key performance measure.

The Ohio Department of Education released report card data Thursday showing how districts performed last school year. The information includes rankings for overall student achievement along with other areas.

Six of 609 districts received an A for their Performance Index, which measures student performance on state tests. That’s down from 37 districts with an A rating last year. More than half of the districts received a C.

Ohio law suspends many consequences tied to the tests for the 2014-2015, 2015-2016 and 2016-2017 school years, as the state transitions to new standards and tests. Education officials say the so-called safe harbor provides an opportunity for schools to improve student achievement.