dear bhargav ,
there is no reservation for oc in any of the competative exams. and there are no regional reservations.
15% and 7.5% seats in each course are reserved for candidates belonging to SC and ST categories, respectively.
3% seats are reserved for Physical disabilities candidates (including leprosy-cured) as specified by the Government of India.For any category of disability (viz., locomotor, visual, speech and hearing), benefit would be given to those candidates who have at least 40% permanent physical impairment in relation to a body part / system / extremity / extremities / whole body etc.