Hello Kumari!
The class 12 Board examinations is held throughout the country. Henceforth, paper-checkers have to go through a lot of answer sheets. Although necessary guidelines are laid down for the paper-checkers to avoid any kind of mistake while checking and utmost care is taken, sometimes errors do occur. Errors while paper checking can be of two types: the answer was wrongly checked (ie. right answer marked wrong) or the answer was not evaluated (marks were not given to the answer). In both the cases, candidates can ask for rechecking and re-evaluating their paper.
If you think you deserve more marks, then definetely give your papers for recheck and re-evaluation.
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