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<p>Based on pretty much every study out there, a statistical basis, test scores are almost as a good an indicator as HS gpa. GPA+test scores is a slightly better predictor that GPA alone. GPA+subect test scores is better that GPA+SAT/ACT scores. And GPA+AP/IB scores is the most predictive.</p>
<p>Of course for certain STEM programs, particularly engineering, a high Math 2 test is de facto required. Otherwise, the adcom will be concerned that the student will struggle with the concepts.</p>