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<blockquote> <p>do they take high school grades into consideration at all, for graduate school?<<</p> </blockquote>
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<p>No. For grad and professional school admission you will be judged on your college performance only. It won't matter how good or bad your grades were in high school. It's the same as how your elementary or middle school grades don't count for college admissions. They don't even ask.</p>