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What if most of the test scores show poor (or even high) score results? Then it becomes a persuasive norm not to improve oneself. The poor scorer will say the tests were too hard, the high scorer will say the tests were too easy.

Better to focus on how to improve the process of teaching and studying. Take the latter, for example. Educators should get up and go into sampled homes of students, sit at the same desk that the student uses to study after daily classes, and observe how the student studies, tackles a problem, work out a solution and memorize the facts.