Hello saif, I'll suggest you to go for IEM. The placement is quite good and companies like TCS, CTS, etc., visit the college for placements to recruit more than half of the students.Faculty in IEM, Kolkata is good , the faculty in this college is good and far better than any other faculty of other private colleges in West Bengal. Most of the faculty are aged and experienced one.

Hope this information helped you. 

Here is my personal priority:

1. IEM

2. Techno india

3. Heritage

These are the rank based on seeing the previous trends of cse cutoffs and placement scenario. Comparatively IEM have much exposure than other available options. Placement and teaching faculty of almost all the given college are comparitively of same level .