However, he says the all or nothing measurement doesn't tell the whole story. In fact, most grade levels showed an improvement in performance this past year though some remained about the same.
While Tata says there is much more work to do, he points to positive trends for African American and Hispanic students as steps in the right direction.
"Student groups that haven't had as much historical success in the past in meeting state standards have seen an increase in greater numbers this past year, so that is good news," he said.
Tata says the data translates into a 2 percent increase in the system's graduation rate.
The U.S. Department of Education uses AYP as a measurement to determine how every public school and district in the country is performing academically based on standardized test results.