Hii,i am here to help you according to your query.Let me tell you the eligibility criteria for doing phd in india as given below:

-Admission requirements. The minimum requirement for entry to an Indian PhD is a Masters degree in a relevant subject, usually with an overall grade of at least 55% (or the equivalent).

-The Indian PhD application process.

-PhD notifications. 

-The Research Eligibility Test (RET) .

-Interviews.

Hope,this information helpful for you.Goodluck.