Thanks for the question 

With 700 rank in sc quota 

You have high chance of getting following colleges -

Government College of Engineering and Leather Technology, Kolkata

Government College of Engineering and Ceramic Technology, Kolkata

University of Calcutta, Kolkata

University of Kalyani, Kalyani

Government College of Engineering and Textile Technology, Berhampore

Maulana Abul Kalam Azad University of Technology, Kolkata

Jadavpur University, Kolkata

All the best