Dear Aspirant,

Invigilator is the person who is also called gaurdian and who is appointed by the authorities to keep an eye or condut exam cheating free

So you will get the sign after the completion of exam

And if you attended the exam and there is no sign I don't that would be a problem for that you may raise a query or get in touch with official Website for more information,

Hope this information helps you,

Feel free to ask,

Thank you.