Oklahoma schools would continue to receive a single letter grade from the state Department of Education under a new plan for school accountability released Tuesday, but the components of the grades would be expanded.

The new system, if adopted by the state Board of Education and the state Legislature, will add measures of chronic absenteeism, post-secondary opportunities and academic growth of English language learners, in addition to student assessments in math, English and science.

The proposed system eliminates the “bonus points” currently awarded for meeting benchmarks in high school gradu...