There is no physical examination for "WORK EXPERIENCE". This particular field is graded on the basis of assessments, internals, etc. However, this is not taken into consideration while calculating aggregate percentage. Aggregate percentage will still be determined by the five main subjects' marks. However, if a student fails in one of the five main subjects, then instead of using that failed subject's marks, marks of additional subject (if any) is taken into consideration for calculation of aggregate percentage marks.

Hope it helps.