Yes, you can apply RTI for Verification of Marksheet to Thiruvalluvar University.
Thiruvalluvar University is a Public State University in the city of Vellore, Tamil Nadu, established by the Government of Tamil Nadu, under the Thiruvalluvar University Act, 2002 (Tamil Nadu Act 32 of 2002). Thiruvalluvar University is a "Public Authority" as per Section 2 (h) of the RTI Act.
You can file the RTI Application for Marksheet Verification to the designated "Public Information Officer" by paying the prescribed fee.
To know more about the procedure to file RTI for Verification please refer https://onlinerti.com/how-to-file-rti-online-for-marksheet