Utah

Dear Harshit,
Just visit the website and fill in the application form, it will redirect you to the details page. The below mentioned link will help you:
https://technoindiauniversity.ac.in/tiuform.php
Kindly visit the same.

Yes, MBA is offered at Techno India Salt Lake Institute. Total 60 seats are available for MBA. It's affiliated to Maulana Abdul Kalam Azad University of Technology.

You will have to crack WBJEE.

http://iem.edu.in/iem-college-of-management/placements/
This link will provide answer to your question.

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.

Techno India has good placements but they really take students in their main campus without any donation so you can look for better colleges like Adamas University or JIS University if you want to take admission in West Bengal.