Hi

Listing your options cleanly, 

CSE at NIT Durgapur, IIIT Kalyani, IIEST Shibpur.

ECE at NIT Durgapur, IIIT Kalyani, IIEST Shibpur.

Firstly choose CSE, as it has better opportunities and relatively a higher salary package. Now Keep aside IIIT Kalyani and chose between NIT Durgapur and IIEST Shibpur. Also, IIEST Shibpur has low NIRF 2019 Ranking but average package at NIT Durgapur is little high, though the highest package is far higher at IIEST Shibpur this year. 

At IIEST Shibpur, 

Highest Package - 39.12 Lakhs

Average Package - around 6 lakhs

And in NIT Durgapur, 

Highest Package - 29 lakhs

Average Package - 6.5 lakhs.

Best of Luck.

Hope this helps.

Cheers!