Hello dear...

With 31400 gmr rank and 1808  SC rank in wbjee,you can get the following government  colleges :

1)Jadavpur university,kolkata(cse,ece,electrical engg.,IT,Civil)

2)University of calcutta,kolkata(cse)

3)Bidhan Chandra krishi vishwa vidyalaya,nadia(agricultural engineering)

4)Kalyani government engineering college,nadia(cse)

5)Maulana abul kalam azad university of technology,kolkata(cse)

Best of luck...