We remember that you are from West Bengal from your previous questions. CMC Vellore is a  Private Medical College and so all the 100 seats are filled through Tamilnadu State Counselling. 74 seats are filled by sponsored children of Associated churches. 10 seats are filled by the children of wards of employees of CMC. 1 seat is sponsored by the Government of India. The rest 15 seats are filled through Open Merit. 3 out of these seats are filled by SC/ST. So if you belong to West Bengal, then it is difficult to study in CMC. But for someone who has the domicile of Tamilnadu, atleast 650 and above is an ideal score.