Congratulations on getting this much rank in wbjee 2018.
You will surely get decent colleges and decent branches on the basis of rank that you have secured in wbjee.
Since you have not mentioned your category i am considering you a general.
https://engineering.careers360.com/wbjee-college-predictor
Visit this link and enter all your credentials to have an idea about which colleges and which branches you wil be getting.
I am posting a list of few colleges which you will get probably
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