(1) Each LEA shall adopt and use the uniform grading system developed by the state board of education for students enrolled in grades nine through twelve (9-12). Students' grades shall be reported for the purposes of application for postsecondary financial assistance administered by the Tennessee student assistance corporation using the uniform grading system. Beginning with the 2019-2020 school year, the state board of education shall not modify the uniform grading system more than once every two (2) years.
(2) The state board of education shall develop a uniform grading system for students enrolled in grades kindergarten through eight (K-8) that LEAs may adopt and implement. Beginning with the 2019-2020 school year, the state board of education shall not modify the uniform grading system more than once every two (2) years.