Engineering Entrance Exam

Your eligibility depends on your marks. But still CUSAT haven't kept a cut-off. You are free to apply at the university website.

Yes, you can. Please go to university website and apply for the same.

Yes, you can apply for WBJEE as the minimum age required in WBJEE is 17 year (born before 31 dec. 2001) And, yes, I would suggest you to try COMEDK exam also, if possible (suggestion).

JEE Mains is a national level engineering entrance exam to make you eligible for computer science engineering in maximum colleges across India. But if you don't want to opt for JEE Mains then there are various other entrance exams as well, check the link below:
https://www.shiksha.com/b-tech/exams-pc-10.

To predict your college please go through this link, it will provide you the details of colleges which you can get -
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor.

You will need GATE scores to join in M.Tech ICT. So since you haven't written GATE, you cannot apply. Sorry but all the best for your future.

Dear Ramavath!
That's not possible to get admission in B.Tech 2018 with your 2017 JEE Mains score. Because the validity of the JEE Mains Marks (and Rank) is of just 1 year. So, you must have to appear in that exam again and score a very good rank. Hope this helps. Good Luck
Upvote the answer if you feel satisfied.

If it is at institute level then yes.

It depends. 50% of the seats are reserved in terms of Chandigarh quota. Else you can check the last year closing ranks in the internet.