Yes, you can file RTI to Jawaharlal Nehru University.
Jawaharlal Nehru University is a Central University established by an Act of Parliament in 1966. The JNU Bill was passed in Lok Sabha on 16 November 1966 and the JNU Act came into force on 22 April 1969. Jawaharlal Nehru University is a "Public Authority" under Section 2 (h) of the RTI Act.
You can file RTI for Marksheet Verification to Jawaharlal Nehru University either Online or through Offline mode by paying the prescribed fee. To know about the procedure for application of RTI for Marksheet Verification please refer https://onlinerti.com/how-to-file-rti-online-for-marksheet
To know further about the procedure to apply RTI Applications's Online for Central Government, please refer https://onlinerti.com/how-to-file-rti-online-for-center