Eligibility for the exam is:
You nationality should be either Citizen of India or you are a subject of nepal or bhutan or Tibetan refugee who came over to India before 1st January, 1962 with the intention of permanently settling in India or you are person of Indian origin who has migrated from Pakistan, Burma, Sri Lanka, East African countries of Kenya, Uganda, the United Republic of Tanzania, Zambia, Malawi, Zaire, Ethiopia and Vietnam with the intention of permanently settling in India.
Minimum age should be 21 and maximum 30 for general category. However, Maximum age limit for M.Phil. qualification is 32 years and for P.hd 34.
If you want any other information or refading any specific category, you may comment.