Chartered Accountant
734 Points
Joined March 2007
Since you have already done the error, there is no point in worrying about it now. Wait for the results and hope for the best. The most you can do is Pray.
Lastly, The regulations for not writing identification marks on answersheets are to prevent cheating in Exams. If the checker feels that the error was not intended as Cheating, but merely a rookie mistake, he might allow as a benefit of doubt.