Kolkata

The online registration starts in May and thereafter the admission will be conducted.
For more details, refer to this link:
http://rbu.ac.in/.

Globsyn Business School will grab the first rank considering the list of tier- 2 B-schools.
According to me, BIBS will come second in that list.
Jadavpur University will be third.
IEM will be fourth.
NOTE- You have asked about tier-2 B-schools. That's why IIM Calcutta, IIFT, IISWBM, IMI and Army Institute of Management have been considered as tier-1 B-schools. MDI, Murshidabad will also make the list of tier 1 considering B-school outside Kolkata.

Hello Pratab,
Well, for getting admission into top colleges of WBJEE, you need to give WBJEE/ JEE Mains and based on your performance, you will get admission. Here is a list of the top colleges:
https://www.google.co.in/url?sa=t&source=web&rct=j&url=https://www.shiksha.com/b-tech/colleges/b-tech-in-computer-science-engineering-colleges-kolkata&ved=0ahUKEwjIy5aysbPXAhXGJJQKHZRbA0sQFghwMAA&usg=AOvVaw2Ig6E0QaB44qiyvNNEuPKM

To teach economics at the high school level, teachers must hold a Bachelors degree in economics or business, have completed a teacher-training program, and you must be certified to teach in Kolkata.
Some colleges may ask for a master degree in economics.

Hi,
Colleges in Kolkata for BBA in aviation:
UPES - Centre for Continuing Education | Kolkata
Aptech Aviation and Hospitality Academy, Kolkata6
TMI Academy of Travel, Tourism and Aviation Studies, Kolkata
Biztech Management School | Barasat, Kolkata

Hi,
You can refer the below link for best college in Kolkata to pursue part-time MBA:
https://www.shiksha.com/mba/colleges/part-time-mba-colleges-india?uaf[]=location&ts=20088745&rf=filters&ct[]=130&ed[]=et_21::dm_33

IIFT is the best and well known college in Kolkata. You should try in that College.