Kolkata

Some of the colleges that offer BCA on merit basis are:
*NIMAS, Kolkata
*Dinabandhu Andrews Institute of Technology and Management
*Swami Vivekananda Institute of Modern Science
*Calcutta Institute of Engineering and Management
*Eminent College of Management and Technology
*Meghnad Saha Institute of Technology
*Sister Nivedita University
*Brainware University
*Nopany Institute of Management Studies
*Techno India College of Technology
*Annexe College Centre for Management and Technical Studies.

IHM Bangalore may be preferred over IHM Kolkatta. Rest will depend on once choice of region also. Since this question has came to me now, but posted b y you 2 years earlier, I hope you have got the right choice of college. All the best.

First, visit this link to check B.Arch colleges based upon your JEE rank:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=connect&utm_medium=CR_JEECP&utm_campaign=6919840
Then visit this link for various colleges which will provide you the brochure:
https://www.shiksha.com/architecture-planning/colleges/b-arch-colleges-india

Follow the predictor below to know which are the best colleges you can get through WBJEE:
https://www.shiksha.com/wbjee-college-predictor
Top colleges in Kolkata :
https://www.shiksha.com/b-tech/ranking/top-engineering-colleges-in-Kolkata/44-2-0-130-0