Can I edit my application after the payment is done successfully?

Dear Nidhi, you cannot change any details once you make the payment and click on 'Submit'. Having said that, there will be a correction window that IIM Kozhikhide would open tentatively in the month of September tentatively between 27th to 30th. Then you can make necessary corrections to your application form. Alternatively you can also raise a 'Candidate Query' and make the necessary corrections. For more information, please visit our page at: https://www.careers360.com/mba/articles/cat-application-form-correction

Hello
As per the guidelines, you cannot edit or change your form details after payment is done.
But there is correction window which will open by iim kozhikore in the month of September so you try once

https://www.careers360.com/mba/articles/cat-application-form-correction
You can visit the above link for more details..
Thus the only option is to reach out to them
Here are the contact details
1-800-266-3549 (Toll Free)
cathelpdesk@iimcat.ac.in
I hope it will help you
Good luck.....