West Bengal

Yes, you can pursue B.Tech or BE in Karnataka after your Diploma from West Bengal. Not even Karnataka, you can take admission all over the India. The syllabus of the exam for computer Science can vary from university to university. So, please specify from which university's syllabus you want.

You can refer https://www.shiksha.com/b-tech/dcet-exam.

Hello Arnab,
One can always study while serving any organisation. Here it's not the Jadavpur University but State Govt whose permission you need to take even before applying. Then you will have to think as to how you will attend classes, find time for study etc. But all these are definitely manageable issues. Just have this as aim and do not leave it untill you achieve it.
Best wishes to you.

For admission in BA Journalism, you need first decide on the college and check the eligibility criteria before applying. Top colleges are:
Institute of Mass Communication Film and Television Studies
St. Xavier's College, Kolkata
Zee Institute of Creative Art, Salt Lake
University of Calcutta.

Sorry, you cannot, you need at least 90 for CBSE/ISC or 85 for State Board to get into SXC.

IIM Calcutta is the 2nd best in the country for MBA in finance (After IIM Ahmedabad).

It solely depends upon your course. Here's top 5 in overall category:
1. St. Xavier's College (Autonomous), Kolkata
2. Ramakrishna Mission Vidyamandira, Belur
3. Jadavpur University
4. Presidency University
5. Ramakrishna Mission Residential College, Narendrapur.

The answer is solely depending on Subject. Xavier's is famous for Mathematics, Chemistry, Microbiology, Biotechnology and Economics, whereas, Presidency is famous for Statistics, Physics, Computer Science and biology (zoology and botany).

It varies year wise and board. Try to secure 95+ (CBSE/ISC) or 90+ (State Board) to ensure your admission.