Dear friend,
The eligibility criteria for both M.Phil and Ph.D varies for every institute. However the basic requirement is a Masters degree or an equivalent degree in the relevant discipline. However the cut off percentages vary. Some of the institutes conduct entrance exams and some of them require atleast two Research Publications for the Ph.D programs. Some also require work experience of a couple of years. Had you mentioned the subject of your interest and your location, we would have been able to help you better.