Hello Ibaad, NEET is conducted by national testing agency, the application for NEET has begun and will continue until December 31st,2019. You can correct if there are any errors(only which are allowed by NTA) in NEET application form from the 15th of January, but if you do not correct the mistakes which you have previously entered, the admit card will not be processed and your application will get rejected and you cannot attempt the exam.

Hope this helps.

Thank you.