hey sheebha!!

am very sorry to say this but once if you have filled and submitted your application,no information contained in it shall not be changed.

please see the question number 29 in the following link:

https://www.iiseradmission.in/faq/

and if you need any more information regarding the exam please visit our website :

https://engineering.careers360.com/articles/iiser-admission

thank you and all the very best