If you have lost your mark sheet from Madras University, you can obtain a duplicate copy by following these steps:

• File a police complaint: This will help you in case of any fraudulent activities that might occur using your lost mark sheet.
• Visit the university: You need to visit the Controller of Examinations office at Madras University with a copy of the police complaint, a copy of your original mark sheet if you have one, and a passport-sized photograph.
• Fill out the application form: You will be given an application form to fill out, providing details like your name, registration number, and the name of the course for which you need the duplicate mark sheet.
• Pay the fee: You will need to pay a fee for obtaining the duplicate mark sheet, which can vary depending on the number of copies you need and the urgency of your request.
• Submit the application: Once you have filled out the form and paid the fee, you will need to submit the application to the Controller of Examinations office.
• Follow-up: It may take some time for the duplicate mark sheet to be issued, so it is important to follow up with the university periodically to check on the status of your application.
• Collect the mark sheet: Once the duplicate mark sheet is ready, you can collect it from the Controller of Examinations office by showing your original ID proof.

In case you are unable to visit the university in person, you may also be able to apply for the duplicate mark sheet online through the university's website or by mailing in the necessary documents.