You dont need to do anything just wiat for the approval by GATE authority and you shall be sent with final approval of rectification . 

All necessary changes willbe made accordingly and then an email/SMS will be sent regarding confirmation .

All details below. 

https://engineering.careers360.com/articles/gate-application-form/amp

Hello Debananda,

In such case, you will be required to make the possible changes in the application form. Just go through the application form once and then make the possible changes. Also kindly let me if you made any changes in the application form after the correction window has opened.

Application form will be under scrutiny for now. It will be over as soon as your application form has been reviewed for any further corrections.

All the best!