Some more circumstantial evidence - the biggest difficulty military recruiters have had in recent times is that only 1/3 of potential recruits can actually pass the qualifying exam. So, again I point to No Child Left Behind and the fact that it's entire emphasis is on teaching students how to pass exams rather than on actually improving and teaching a curiculum.
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'He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me.'
-TJ
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