Incoming student-athletes in Divisions I and II are subject to academic initial-eligibility standards, which take into account standardized test scores, number of core courses taken in high school and the grades earned in those core courses. In addition to NCAA requirements, they also must also meet the unique acceptance requirements of the university they plan to attend (those requirements may exceed NCAA standards).
Division I student-athletes are also subject to progress-toward-degree rules that require them to advance toward graduation each year.
Division III institutions hold student-athletes to the same overall standards for the institution in which the student-athlete is enrolling.
For more information: http://www.ncaa.org/student-athletes/future