Election duty excemption

I am about to get election duty in my state of Karnataka as Preciding officer. My head of institution while providing staff position mentioned in remark column as I am away from duty and relived to perceive Bachelor of education at my own cost without salary and services as DIES NON period. So my question is necessary for me to attend election duty even though am not in service. It's tough for me to drop my studies for few days as it near to my semester exams.