For most PG entrance exams in India, the medium is English, especially for technical, management, and science courses like M.Tech, MCA, MBA, or MSc. However, for certain state-level PG entrance exams or courses in Arts, Education, or Social Sciences, the paper may be offered in both Hindi and English (and sometimes the regional language of that state).

If you tell me which PG entrance exam you are asking about, I can give you the exact medium details, because it varies from exam to exam.