For decades, American students and schools have fared poorly when compared to those in other developed nations. And now, according to a recently released study, the U.S. education system remains mediocre, getting a grade of C minus for the third straight year.

The K-12 Achievement Index, a major indicator in the recently released “Quality Counts” report by Education Weekly, provides ranks and grades for each state based on their "improvement in educational policies and practices".

According to K-12 Achievement here are, educationally, the bottom ten states.

10) Oklahoma

9) Michigan

8) South Dakota

7) South Carolina

6) Alaska

5) Alabama

4) West Virginia

3) New Mexico

2) Louisiana

1) Mississippi