hi,

I assume you are asking about m.e /m.tech course on environmental science and engineering. see it comes under interdisciplinary streams and students of  B.E. / B. Tech - Civil / Env. Engg / Architectural Engg / Biotech / Chemical Engg. / M.Sc. - Env. Sc. / Env. Chem. / Env. Tech./ Env. Botany / Env. Ecology / Ecology / Geoinformatics are eligible to apply for n.tech course. to take admission in nits or iits you need to appear in gate exam.

you may follow the below link to know about environment engineering colleges in india,

https://engineering.careers360.com/colleges/list-of-me-mtech-in-environmental-engineering-colleges-in-india