Hello student,

As per your query, since you have damaged your class XII marksheet, you need not to worry. Just visit the official website of Central Board of Secondary Examination-CBSE and apply for issue of class XII marksheet. You will be required to fill your basic details like your name, father's name, class and board roll number. It will cost you a small amount but yes you will receive your marksheet within 10-15 days via post.

Hope it helps!!