Hi Aspirant!

The following statement is written in the useful information section of IIT bhubaneshwar website. "Candidates are required to fill all the fields in the application form with specific and valid data. Please ensure that information provided is accurate as no change is allowed after submission of application . " Check official website:- Useful information | IIT Bhubaneswar

While on IIT bombay website in M.Tech instructions section of application form this is written:- "You can unfreeze the form and submit the same again". You can unfreeze to make correction before last date. Check the official website:- IIT Bombay M.Tech. Online Application help

I hope it helps. All the best!