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<p>High school grades are nowhere close to perfect predictors of college performance, but they are the best predictors available to college admissions committees in general. Standardized test scores do add some predictive value, though less than high school grades, and their predictive value depends on the test and the student’s major (e.g. SAT math has a strong correlation to college success majoring in math or physics, but no correlation overall, presumably due to lower scorers choosing less math-intensive majors).</p>