Gujarat University — error on form filling page for gu convocation

I have filled the whole form, no field is left empty. Still there is an error showing which says : please, select month & year of examination, not date of issue of marksheet

Please explain to me where to enter the month and address of the examination if there is no field to enter into.

What kind of a stupid institute is this. To that a person have to hassle so much to just fill a simple form.