I took a lower division biology class with a professor who had the lowest average out of 3 other professors. Worst professor ever, did not teach during the following semester.
Later I took an upper division biology class with a professor who had the lowest average out of 2 other professors. Apparently is the “best professor teaching the class” and is tenured.
There are too many variables to factor in. Solely looking at average test scores is not enough to gauge a professor’s competency