Suppose if answer key provided by nta is wrong and if those question are challenged then will all candidates get marks or for only those who have attempted that question and nta accepted their answer?
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No, nta doesn't gives bonus marks to all the students. Bonus marks are given when a particular question was incorrect in the examination or any of the options were not right and the officials got to know about it when the students challenged the answer key, the students who would have attended these questions would get bonus marks equal to the marks that the question carried. If a student hasn't attempted the question, the he/she will not get any bonus marks.