Hello.
In terms of rating and ranking IEM is prior than techno salt lake, facilities are provided by both but if it is about education is of both are providing good education so you can see according to the rating and student feedback which is given positively, in terms of placement both are having comparable placement percentage but if you want to go for government job after your BTech then I would suggest you to go with mechanical engineering while for ECE also there are government job available but you can go for it because after CS/IT placement, next number comes off EE//ECE.
for a detailed comparison between both the colleges you can go with our college compare tool from the provided link:
https://www.careers360.com/compare-colleges
Best of luck.

JNEC Aurangabad

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IEM Kolkata

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