The eligibility criteria to appear in the Entrance exams for M.Sc. in Environmental Science, is that the applicant should have completed graduation in any science discipline preferably biology or environment from any recognized university of India. The minimum marks required for admission is 50%.

For your reference here I am also giving you the list of some good colleges offering M.Sc. in Environmental Science:

University of Delhi

Osmania University

Jawaharlal Nehru University

PSG College of Arts and Science

Shivaji University

Acharya N G Ranga Agricultural University

Aligarh Muslim University

Amity University

Dr. Ram Manohar Lohia Avadh University

Anna University

TERI University Delhi
Jamia Hamdard Delhi
Banasthali Vidya Peeth Banasthali
Jawaharal Nehru University Delhi
University of Delhi Delhi
Aligarh Muslim University Jaunpur, UP
SASTRA Tanjore, TN
Bharati Vidyapeeth Pune
National Environmental Research Institute Nagpur,Maharashtra
Gurukula Kangri* Vishwavidyalaya Haridwar, UP
Dr. Ram Manohar Lohia* Avadh University Faizabad, UP
Amity University Noida, UP
Guru Jambheshwar University Hissar, Haryana
University of Jammu***************************************** Jammu, J&K
Forest Research Institute Deheradun
University of Rajasthan Jaipur, Rajasthan
Anna University Guindy, TN
University of Madras Chennai, TN
Tamil Nadu Veterinary and Animal Sciences University Chennai, TN
Bharathiar University Coimbatore, TN
Cochin University of Science and Technology Kochi, Kerala
GB Pant University of**Agriculture and Technology Pantnagar