Evaluating teachers on test results is flawed
Campaign claims of rising test scores are probably premature. To get an accurate assessment of test results you need at least three to five years of test results.
There is in education a phenomenon of test results improvements with almost all new programs. But as the novelty wears off, test results drop back to where they were.
The effort to evaluate teachers based on test results will probably have a negative impact on the education of the less gifted students.