India

Hello Parives,
You may refer the link below for the list of top MBA colleges in India :
https://www.shiksha.com/mba/ranking/top-mba-colleges-in-india/2-2-0-0-0

The best college for any category student would be Maharashtra government's SIMSREE. The fee for an OBC student is just 2000/- library deposit.

You have a lot of options left with you as you have done you Masters. If you are very much interested in academics, then Ph.D is the obvious choice for you after completion of your M.Tech.
If not, then there are number of corporate giants that seek M.Tech pass outs as they want to hire subject matter experts. M.Tech makes you eligible for jobs in such big companies like google, Microsoft and more.

Hello Girish,
Here are a few college for M.Sc in statistics course in Kolkata:
1.Jayasree Academy
2.Amity University - Kolkata
3.JIS University
4.University of Calcutta

Please visit the link mentioned below for the approximate scores in CAT, MAT, XAT and MH-CET:
www.dtemaharashtra.gov.in

The eligibility for MBA is graduation. However, you've completed BCA so you're eligible to pursue MBA.

Hello Suman,
Please refer the link to get more insights of the colleges and branches:
https://www.shiksha.com/resources/college-comparison

Yes, there are many foreign colleges/universities offering online or distance learning degrees in M.Sc. (IT). For a list of colleges, please check online.