hello gaurav mahi ,

The application form correction window is from March 11 to 15 .

In case students change to both papers, they will be required to pay the balance fee. 

for more details go to below given link :-

https://engineering.careers360.com/articles/jee-main-application-form-correction

Hello. 

The application form correction window is from March 11 to 15. You can make changes to a lot of entries in your application but cannot change the exam city. Also, no fee will be refunded to the candidates if they want to drop any one the two papers they might be attempting.

Refer this link to know more:

https://engineering.careers360.com/articles/jee-main-application-form-correction

Good luck!