Hello Rahul Kumar,

Thanks for asking this question.

I am listing down the important books which you must follow:

For Maths:

Objective Mathematics by RD Sharma,

Objective approach to Mathematics by A M Agarwal (Arihant publication),

Play with Graphs  by A M Agarwal.

For Physics:

DC Pandey All 5 parts.

For CHemistry:

Physical Chemistry by P Bahadur,

Inorganic Chemistry by O P Tandon,

Organic Chemistry by R K Gupta or JAgdamba Publucation or Solomon's 

You can check our website link for more info :https://engineering.careers360.com/articles/how-prepare-for-wbjee-2019

Thank you.