Moumita, your qualification code is to determine your eligibility criteria. It has got nothing to do with your NEET exam or admission for MBBS. It is quite common that Candidates enter the wrong qualification codes due to confusion. But this is not a reason why your application will be rejected. As you cannot go back in time and correct the qualification code as the correction window has closed, do not worry about it. Lets wait for the admit card to be released. Because to be honest with you, this is beyond your hands. But a wrong qualification code is not the reason why your application will be rejected.