Mohit, NBE has stated few fields that you cannot change even during the correction window. They are your Name, Date of Birth, Gender, Nationality, Photograph, Signature, Email Id, Mobile No#, Exam City and Category. The rest of the fields, you can make changes. NBE will open the correction window from December 7th to December 15th. During this period, you can login to the official website with your login credentials and make necessary changes to your application. So you can make changes regarding the completion of your application from December 7th when the correction window opens.