Yes, you can apply RTI for Marksheet Verification to Bharathiar University.
Bharathiar University is a State University established in February 1982 under the provision of Bharathiar University Act, 1981 (Act 1 of 1982) and was recognized by the University Grants Commission (UGC) in 1985. Thus, Bharathiar University is a Public Authority as per Section 2 (h) of the RTI Act 2005 and comes under the ambit of the Act.
Hence, you can apply RTI for Marksheet Verification to Bharathiar University by paying the prescribed fee.
To further know the procedure for filing RTI's for Marksheet Verification, please refer (https://onlinerti.com/how-to-file-rti-online-for-marksheet)