Walton High School was the top-performing high school in Cobb County for the 2012-13 school year, according to state education data released Monday.

Hightower Trail ranked top among middle schools in Cobb while Rocky Mount garnered first for elementary schools, based on information released by Georgia's Department of Education.

Schools and districts are receiving grades through the state’s College and Career-Ready Performance Index, which uses student test scores, academic progress and closing the gap in performance between groups of students to come up with a numerical grade of zero to 110.

Check back for more updates on other school districts across the metro area. To get a look at all the results for schools in Cobb and across the metro area, check out MyAJC.com

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Wade Roberts (center), a Decatur parent with children in three of the city schools, addresses concerns  with the possibility of a K-2 school closing. (Daniel Varnado for the AJC)

Credit: Daniel Varnado/For the Atlanta Journal-Constitution

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Rose Scott signals as Closer Look goes on air in the WABE studio. An Atlanta resident left WABE a $3 million donation, a boost after WABE lost $1.9 million in annual funding from the Corporation of Public Broadcasting. (Ben Gray / AJC file)

Credit: Ben Gray