accountability, college/career readiness, and Common Core

So I recall years ago, asking some professor or district official as to why there was such a push for "accountability" and testing. Their answer was one that I saw reflected in education circles, research, and newsletters... the idea that grades are subjective and that an A one place is a C elsewhere. Therefore, how can we judge a student's abilities (ie for college entrance ) by subjective grades? How could we , the public, even "judge" a school if grades were given willy-nilly? Does my child's B really "mean" a B? Would the same work merit a B elsewhere?
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So, "supposedly", this high-stakes accountability environment came about to "prove" what students learned and how well. This could in turn translate to the workforce and college world. A B isn't always a B but a score of 520 or Proficient is scientificslly validated, determined, measured. Its difinitive.
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So surely the ongoing test test test environment, exponentially rising under common core, adds to the accountability and validity of learning. Right? And if learning is all about college and career readiness and we must stop kindergarten dramatic plays in NY to get five year olds ready for the workforce, then these tests should help determine , well, something to do with college /career readiness. You know, like the SAT supposedly does.
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But wait. A recent study tried to correlate SAT scores with success in the first yar of college, in an attempt to develop cut scores of college readiness/success. Excdpt...the study kind of failed. There was at most a 22% correlation of SAT scores to college success. They found grades, yes those subjective fuddy duddy unreliable measures of yore, to be a better measurement for success.
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And yet, the elitist educrats still pump out this propaganda that we need and want accountability which can only be found through standardized testing. Even if there is only a 22% correlation, since, well, we are applying quantitative reasoning to qualitative subjects. It make you wonder, what IS the purpose of all thistesting and data then, if not to effectively measure or predict a damned thing?