Hey Harshitha,

First call up the help centre. The number is 1800 266 6282 ( India Toll Free ). Ask what next to do. While it is correct that there is no correction facility for NATA application form, it is also a fact that you can try. See NATA scores are accepted and COA doesnt do the counselling so it still may be possible for you to approach the colleges for admissions pointing out that it was a mistake. I cant guarantee anything but no harm in trying as if you wont try you wont even know if you have some chance. All the best!