Hey there according to your rank in jee mains and last year cutoff of nit durgapur for other state 

Branch                                    closing ranking

Electrical engineering                15743

ENTc                                             12249

Last year cutoff for iiest shibpur

Branch                  closing ranking in final round

Mechanical                      21896

Mining   engineering            40008

As the ranking every year doesn't varies much. So according to that iiest shibpur will be the safest option.

All the best!!