Colleges in West Bengal

It changes based on multiple factors but generally you would have to spend atleast 5 hrs daily.

Eligibility criteria:
Students with 60% aggregate marks (or an equivalent grade point average) in Bachelors degree in any branch of Science, Engineering, or Medicine are eligible to be apply for admission. Students from the SC, ST, OBC (non-creamy layer), and PWD categories shall be given a relaxation of 5% marks.

Yes, you can very well get admission. For list of colleges you can check online.

Yes, you can pursue a 3 year LLB course now. You will have to give entrance exam to get admission in this course.

Yes, you are eligible for Masters Degree in Social Work.
A candidate who has passed B.S.W. / B.A. degree examination fromunder a recognised university can see MSW admission. A candidate who has secured minimum of 50% aggregate marks in B.S.W. / B.A. degree under a recognised university has the required MSW course eligibility.

GATE is compulsory to take admission for M.Tech in IITs.

For top IITs CSE branch, you will need under 1000 rank and for IIT BHU ECE branch you will need to score under 3000 rank.

You have to clear all the subjects only then you will be able to pursue M.com.