enrollee

from WordNet (r) 3.0 (2006)

enrollee
    n 1: a person who enrolls in (or is enrolled in) a class or
         course of study

from The Collaborative International Dictionary of English v.0.48

enrollee \enrollee\ n.
   one who is enrolled, especially a learner who enrolls in (or
   is enrolled in) a class or course of study.
   [WordNet 1.5]