<p>They don’t require it when you’re applying, but I strongly believe they do once you’re matriculated. The rare genuises that got into top schools in their early to mid-teen usually graduated highschool already or have taken the GED test (which shouldn’t even be a crossword puzzle if they are that bright). Most of the top-schools’ admission letters that I got the chance to read usually end with: “this admission is given with the understanding that you will complete your highschool education to satisfactory,” or something to that effect. I have yet seen a school that advertises on its website about the unnecessary of HS diploma or GED in matriculation, perhaps Kamikazewave could give me a link to those that do.</p>