Dear Student,

As for your question, if even one individual challenges a question and that challenge gets stated correct, all the aspirants in the country will be benefited.

As to apply individual or not rests upon your mind.

However, if you wish to challenge the NTA, here is a little help for you.

NEET 2019 KEY Challenge and how to apply:

• Visit NTA official website: www.ntaneet.nic.in.
• Login with your Application Number, Password and Submit.
• Click on 'Apply for KEY Challenge'.
• Select you choice of questions to be challenged.
• The number next to the question under the column 'Answer as per NTA stands for the correct Answer Key to be used by NTA.
• Once you select any question for Challenge, you will see four options under the column 'Suggested Answer(s) by the Candidate'.
• If you wish to challenge, you may use anyone or more of the Option IDs given in the next four columns by clicking the checkbox.
• After clicking your desired option for all Questions you want to challenge, scroll down, 'Submit' and move to the next screen.
• You will find a screen displaying your challenges.
• Click on 'Final Submit'.
• Submit the fee by selecting your mode of payment.

I believe that your query has now been solved.

BEST OF LUCK!!