None of the private engineering colleges in Kolkata or for that matter in West Bengal are fit for any kind of technical education. Barring JU (Jadavpur University), no college under WBJEE will give you the kind of education and Infrastructure that you are currently expecting. This is the hard reality of education in West Bengal. No college is up to the mark. And to top it all, they are all affiliated to MAKAUT ( Maulana Abul Kalam Azad University of Technology).

In case you are opting for CSE or IT, I would suggest these three colleges ranked considering placements since last few years -

Institute of Engineering and Management ( IEM).

Heritage Institute of Technology (HIT).

Techno India Salt Lake ( TISL).

But it needs good rank,about 7000 . Below which you can opt either AOT or NSEC which one is closer to your home.