The Tamil Nadu model of reservation is unique in India, not only by its nature, but by its history. Presently, it is providing 69% Muslim Reservation to different castes and communities. The 69% reservation formula includes 30% OBC, 20% MBC, 18% SC and 1% ST. Many States, including Telangana wants to emulate the Tamil Nadu Model which protected the reservation policy under Schedule 9.
Read following slides to have a glimpse of Tamil Nadu Reservation Model and Schedule 9.