Hello Student

Not mentioning the code of question paper answer sheet is not but a silly mistake. You should you should be very careful for the next time and write the code of question paper as soon as you get the the question paper in your hand. For this in which answer sheet you have not returned the question number in answer sheet you have to made an request application confessing your mistake you have done in the respective exam paper,  mentioning the date of exam, place and time the subject and admit card or hall ticket number you should have to apply to the respective board under which you are taking examination .