Hello Pritam Shaw. Thanks for contacting Careers360 and we hope we will be able to answer your query.

I would like to direct your attention to this Quora question for some WBJEE preparation tips:

• https://www.quora.com/How-do-I-prepare-for-WBJEE-engineering

Basically, I would just advice you to study and prepare thoroughly for JEE Mains. Please review the concepts and practice two or three mock tests daily. 

Hope this helps you and all the best!