Colleges in West Bengal - Other

It's impossible to get with your OBC B rank. I don't think they have OBC B category in CSE. So please check this year's seat matrix well before filling up (You'll find it in one of the WBJEE sites).
But you might still keep it as an option, so that you don't miss the college if you have a chance.

If you have confident you can fo better. Then you can wait. But if you haven't enough confidence or you have confident but now you can't give the same effort or time on study. Then you should apply for WBJEE counseling. But some of my experiences said that it's very hard for a person after 10+2 exam to give same effort on study as he/she gave previous. And due to corona everyone faced problem. So now this is depends on you. If you heart say 'Yes I can do' then wait otherwise WBJEE Isn't a bad option.