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(WBIR) A new study finds Tennessee is getting some of the highest grades in the country for teacher policies. Tennessee ranked in the top four states.

The Volunteer State, Louisiana, and Rhode Island all received a B. Florida got a B+.

The report from the National Council on Teacher Quality found 37 states improved their teacher policy scores. The score measures areas of teacher effectiveness, teacher evaluations, and education reform.

Tennessee ranked high because the state requires annual evaluations, and student achievement is a strong factor in measuring how teachers are performing. The report also acknowledged Tennessee's stance on tenure and policies toward ineffective teachers.

Some teachers have publicly complained about the state's policy on those issues.