The Oklahoma City school district continues to struggle when it comes to the state’s controversial tool for measuring academic success.

More than 60 percent of district schools received a grade of F or D on annual report cards released Wednesday by the state Education Department.

Oklahoma City district schools received 42 F’s, 17 D’s, 15 C’s, 8 B’s and 10 A’s, according to a department report. Charter schools scored six of those A’s, two B’s, two C’s, one D and one F.

The grades are based on test scores and data from the previous school year.