Dear Ajay, when the correction window opens on January 14th, you will be able to correct your qualification code. The window closes on January 31st. Once the window opens, please login with your Neet credentials and make the changes. As the correction window is valid for only one time, please make a list of the corrections that you need to make and make them in a single go. Once you make a correction and confirm it, you cannot make any further changes.