Gov. Bill Haslam is thanking teachers and administrators for improving the state's standardized test scores. Preliminary results from the Tennessee Comprehensive Assessment Program released on Thursday showed math scores in grades 3-8 improved by 7% this year over last year and reading scores improved by 3.7%. In 18 school systems, student scores improved by 20% or more. Release of the scores follows education reform legislation signed into law by the Republican governor that left many educators unhappy. The tenure law, in particular, requires a teacher to be on the job five years instead of 3 to get tenure. And it creates a way for job security to be revoked for poor teaching performance.