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I have met several outstanding high school students who were taking graduate-level math courses in high school, and all of them now attend tippy top universities. Two come to mind who didn’t even finish high school. (One attended Carnegie Mellon after his sophomore year of high school, the other Penn after his junior year. Others who opted to finished high school first went on to Princeton, Harvard, MIT and Stanford.) </p>
<p>So no, I don’t think that accelerating him in math would be a problem for college admissions. </p>