A Normal subject is a compulsory subject that must be completed in order to meet the requirements of a course. Normal subjects added are applicable to all the students in a batch.
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An Elective subject is not a compulsory subject and can be chosen from a list of subjects according to the study plan. Elective subjects added under an elective group can be assigned to students who prefer to take that subject.
Click here to know more about creating/modifying Elective groups and subjects.