If you have lost your mark sheet from Madras University, you can obtain a duplicate copy by following these steps:
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.
You can take the photocopy of your certificate along with the loss of the certificate form and fill it. Take it to the exam section located opposite Marina Beach in the Madras University
They would charge a nominal fee and would provide the mark sheet in one or two weeks and if pleaded, they can also give it on the same day. No police verification is required and would be easy as the people there know English and can communicate with the other state people also.