I should have posted this quote a long time ago

 "[A]chievement tests may well be valuable indicators of general school achievement under conditions of normal teaching aimed at general competence. But when test scores become the goal of the teaching process, they both lose their value as indicators of educational status and distort the educational process in undesirable ways. (Similar biases of course surround the use of objective tests in courses or as entrance examinations.)"

 Donald T. Campbell via Wikipedia.

With that in mind, take another look at this and this.