Kolkata

https://www.shiksha.com/resources/college-comparison
Please click on the above link to get all details about both the colleges. It is Shiksha's online college comparison tool that helps you choose the best college for you.

Heritage institute of technology if one of the best private Colleges of West Bengal. Placement is very good there but just for CS/IT branch.Other branches has average placement.

Amity is one of the good colleges in Kolkata. Apart from Amity, you can also go for Xavier's which is the best for management studies.

Hello Sanjeev,
You may refer the links below and see list of colleges for BBA in Kolkata and Delhi :
1) https://www.shiksha.com/bba/colleges/bba-colleges-kolkata

Please check the link for complete detail about the college you can get by this rank please must enter your category and Branch specified for better results
https://www.shiksha.com/b-tech/resources/wbjee-college-predictor

Although it cant be predicted with a certainity, but if you are a boy, you can expect to get through if you have above 93.5%. Girls might need little more than 94.5%. This is because morning batch which is boys only has a little lower cut off due to more seats. Girls can get into evening batch which is co-ed.
Its a great college for B. Com Honours, if you are considering it as an option.

Hello Sayan,
The following links are the placement season details of each IMU Mumbai and Kolkata-
https://www.quora.com/What-is-the-placement-record-of-IMU-in-Mumbai-for-marine-engineering
https://www.quora.com/How-good-is-IMU-Kolkata-for-marine-engineering-What-are-placements-like
Hope this helps. All the best.