Yeah! A lot of students appears for JEE MAINS who gives WBJEE with the same preparation and cracks WBJEE even if they can't crack JEE MAINS. WBJEE is a exam easier than JEE MAINS but for this exam you need to have a strong memory as most of the question appears formulae based and in chemistry a good number of memory based questions came. So you have to make this slight changes with your preparation.

You can consider the books Rudiments of Chemistry, Physics, Mathematics to be a instrumental to understand the patter and the likely mode of questions asked in WBJEE.

You may visit the link below to know more about the WBJEE preparation tips:

https://engineering.careers360.com/articles/wbjee-preparation-tips

I hope this answer helps. All the very best for your future endeavors!