Yes. You can register more elective subjects than required during the Add/Drop Period if you wish to broaden your academic profiles as long as the maximum study load (i.e. normally 21 credits per semester) is not exceeded.
There is no limit for accessing the subject registration function during the Subject Registration Period, the Adjustment Before Semester Commencement Period and the Add/Drop Period.
Students of Full-time Undergraduate programmes can register the additional subjects outside curriculum to broaden their perspective during the last two days of the Add/Drop Period via eStudent, subject to not exceeding the maximum credits allowed and ...