Marshall does not have a prep school. There is a community college intertwined with Marshall that is a separate entity. But what I think you are thinking of is Marshall's HELP (Higher Education for Learning Problems) Program. The HELP Program is set up for any student if they need a tutor, work study or just need guidance.
http://muwww-new.marshall.edu/help/
He will be in the 1st Freshman class that will get to use the new IAF (Indoor Athletic Facility), student academic center and sports medicine center. All scheduled to open in Aug. 2014. Hernandez isn't the first Florida recruit that Doc Holliday has taken away from a school in Florida. Since Holliday has been at Marshall, he has taken 9 kids away from schools there. He isn't known as the best South Florida recruiter for no reason.