The TamilNadu Dr.M.G.R Medical University describes clearly the procedure to obtain the transcript on their website: tnmgrmu.ac.in

• Go to the official website.
• Scroll till you reach the end of the webpage and select - Service.
• Then select whatever services you are seeking.

You might need your transcript for higher education in another country. For this contact M.G.R University at least 3 months prior to the deadline of your university. The processing time is extremely slow and you might not receive a proper response from them unless you go directly to their office in Chennai. 

If you ask someone to do this on your behalf, do not forget to write a letter indicating the person is here on your behalf.