what should I choose environmental science and engineering(dual) at IIT bombay or Environmental engineering at IIT (ISM) dhanbad or civil IIT delhi as per placement is considered?
As of these branches are considered, I would suggest Civil Engineering. Civil Engineering is one of the core engineering branches and the placement record is definitely better than environmental branches. Job opportunities are very less for environmental branch out in the industry. Since IIT Delhi is an excellent college to study, it is a safer option also.