u/Clingyex

How to challenge a grade given to me in a course? Like in last semester endsem papers weren't shown so I guess there might have been a discrepancy in my paper checking. And I am 99 percent sure. I know it's too late to challenge the grade of a course offered in previous semester? But I can bet with my life that I have been given the wrong grades and my grade can result in a maximum of +2 or +3 grade. I want to ask, is it possible? How?

If not possible, still tell the general procedure/ deadline other things to challenge a course grade in general?