Thanks for the question 

With 70000 rank in WBJEE, you can get your favourite branch.. ECE in following colleges -

Future Institute of Engineering and Management, Kolkata

MCKV Institute of Engineering, Howrah

Dr BC Roy Engineering College, Durgapur

Birbhum Institute of Engineering and Technology, Birbhum

Camellia Insititute of Engineering and Technology, Burdwan

Kanad Institute of Engineering and Management Mankar, Durgapur

College of Engineering and Management, Kolaghat

St Mary's Technical Campus, Kolkata

All the best