certificate of service

Aastha Agrawal (121 Points)

08 February 2018  
Hello everyone!
I have got my certificate of service signed by my principal for NOVEMBER 2017 attempt.
my query is, can I use the same certificate of service for MAY 2018 attempt?
will it be valid?
(it was actually really very tough for me to get that certificate signed..)
or again I have to go nd request my principal again nd again to sign COS.
I will be completing my articleship on 26.04.2018.
PLEASE HELP!