Hello Student

This is a very serious situation and you should definately  contact the NTA and you should challange your omr sheet .

You can login in the following link and there will be a option to challange the omr responce :-

http://ntaneet.nic.in/ntaneet/welcome.aspx

You can also use our collage predictor to understand your standing in the competetion:-

https://medicine.careers360.com/neet-college-predictor?icn=QnA&ici=qna_answer

I wish you very best for a very Bright Career Ahead. I am always available for any further queries.

Thank You.