subcollege

adjective
sub·​col·​lege | \ ˈsəb-ˌkä-lij How to pronounce subcollege (audio) \
variants: or sub-college

Definition of subcollege

: occurring below the college level especially : of, relating to, or being post-secondary education to prepare students for college At St. Louis Community College, as at most community colleges, anyone can enroll. But those who test as unprepared for prime-time college work must take subcollege courses first—from a menu in reading, writing and mathematics. — Susan C. Thomson