The information was released Thursday by the state Department of Education for the 2012-13 school year.
Nearly 21 percent of Arizona public schools improved at least one letter grade, while about 16 percent decreased at least one letter grade.
The schools’ grades were based on students’ academic improvement and performance as measured by scores on the Arizona’s Instrument to Measure Standards test.
Many of the Phoenix area’s biggest school districts received an “A” including Chandler, Gilbert, Deer Valley, Glendale Union, Tempe Union and Scottsdale Unified.
The Mesa, Dysart and Paradise Valley unified school districts were graded “B” while Phoenix Union High School District got a “C.”