Hi !

No, every student is not required to challenge the answer , If one student has challenged a particular answer , and if the answer is accepted by NTA , it will benefit the whole community of NEET aspirants. But if you feel , that the answer is wrong , you should challenge it because you don't know whether the other student is challenging the answer in the same way that you want or you are sure of because it also requires explanations. Since , the fees is non refundable , each student will think that another will challenge it , why do we do so ?.

But you don't the way of challenging of other student , so if you are sure you should give it a try.

All the best !

Check out the following link for more detailed information:

https://medicine.careers360.com/articles/neet-official-answer-key