HARI SREENIVASAN:
In May, Castellanos graduated fifth in her high school class with 60 college credit hours and a two-year associate's degree. It was a different story for Stephanie's older sister, 24-year-old Alex Castellanos, who attended high school just a few years earlier.
ALEX CASTELLANOS, Sister of Stephanie: When I was there, they didn't have the early college. So, once they offered it to her, we were all saying to go for it, because I didn't have that chance.
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