I once received a reward for raising test scores but it wasn't because I was a better teacher. I noticed my first year as the ole Social Studies teacher that many students did not try on their yearly achievement tests. Many completed the social studies section by creating simple geometric designs on their scanner answer cards.
The next year I offered bonus points toward their class grade for achievement test scores above average. No points were deducted for low scores, but if a student got points above average on the S.S. section, they got points toward their final grade class grade. It was a move not approved by the admin, but the students approved of it, some telling me that for the first time they actually tried to answer the questions.
When the results came back, the Superintendent told me S.S. scores for the school went from near bottom to near top.  I told her I had just motivated the kids to do better.
After 5 years I quit over classroom management challenges. Now I teach adults