Dear applicant, JNU conducts entrance exam, JNUEE every year to offer admission to students of different curriculum. Coming to subjects, in Master's or PG programme, there are different specialisation in M.A ( different languages like Hindi,Urdu etc.) Or Economics or MCA etc. You will have entrance for M.Sc Biotechnology too, so overall you need to prepare for the subjects in which you want your curriculum to pursue but have some general knowledge skills too.

Good luck!!