course registration
Used in university contexts for the process of signing up for classes each semester.
The course registration period is until next Friday.
I forgot to register for courses and couldn't get the classes I wanted.
履修 means taking a course, while 履修登録 specifically refers to the registration process.
登録 is a general term for registration; 履修登録 is the specific compound for course registration.
Compound of 履修 (taking a course) and 登録 (registration).