From the U.S. College Board web site:
Division I:
16 Core Courses
4 years of English
3 years of math (algebra 1 or higher level)
2 years of natural or physical science (including one year of lab science if offered)
1 extra year of English, math, or science
2 years of social science
4 years of additional core courses (from any category above, or in a foreign language, nondoctrinal religion or philosophy)
Division II:
16 Core Courses
3 years of English
2 years of math (algebra 1 or higher level)
2 years of natural or physical science (including one year of lab science if offered)
3 extra years of English, math or science;
2 years of social science
3 years of additional core courses (from any category above, or in a foreign language, nondoctrinal religion or philosophy);
4 extra years if enrolling on or after August 1, 2013
Academic standards
Division I eligibility
All students entering college must have completed 16 core courses in high school.
Students must earn a minimum required GPA in core courses and a combined SAT or ACT sum score that matches this GPA on a sliding scale, which can be found in the NCAA Eligibility Center Quick Reference Guide (.pdf/270K). Requires Adobe Reader (latest version recommended).
Division II eligibility
All students entering college prior to August 1, 2013, must have completed 14 core courses in high school.
All students entering college on or after August 1, 2013, must have completed 16 core courses in high school.
Standards require a minimum GPA of 2.0 and a combined minimum SAT score of 820 or sum ACT score of 68.
NCAA core courses definition
An academic course in one or a combination of these areas: English, mathematics, natural/physical science, social science, foreign language, comparative religion or philosophy.
A four-year college preparatory course and a course at or above the high school's regular academic level, for example, an AP® class or outside college course.
Remedial courses, or those taught at a slower pace or that cover less content are not admissible. And not all classes that meet high school graduation requirements meet NCAA course work requirements.