VALIDITY OF COUPON FOR ONLINE ORDERING BOOKS

priyanka parmar (45 Points)

18 January 2020  
My registration for final (new) as on 03/03/2018.I have already ordered group 1 books and received it a year ago.What will be the maximum period for validity of coupon for group 2 books.
at the time when i had registered it was 2 years.
now it has 3 years validity .
does applicable to me or not?