To add exam subject, go to Examination > Exam Group then click on Add icon present at Action column in exam group list, at click of this icon Exam List page will be open.
Now click on the Exam Subject icon present at Action column in the exam list page, at click of this icon Add Subjects modal will be open.
Here click on the Add Exam Subject button present in the right side of the add subject page, at click of this button new column box will be added then fill the details Subject, Date, Time, Duration, Credit Hours (If you are using GPA grading system exam type, then enter the credit hour otherwise ignore it.), Room No., Marks (Max) and marks (Min.) and then click on Save button. If you want delete any subject then click on Remove icon.