Hello Aspirant, First of all you should take a print out of the WBJEE syllabus, so that you should know which topics are there are in syllabus which are not.Then you should buy WBJEE Chapter Explorer of MTG publication for both the papers Mathematics and Physics + Chemistry, This book contains previous years WBJEE questions chapter wise.After that Read a chapter then do the questions of that chapters from this book, after solving questions you will get knowledge of level and types of questions asked in WBJEE Exam.This books is very useful for the preparation of WBJEE Exam. Use this book it will help you very much.More over you can also solve JEE Mains previous years paper as some JEE Main previous year questions are directly asked in WBJEE,and NCERT is most important book for WBJEE Exam as questions are asked directly from NCERT.