Any books or exams (previous) from which WBJEE regularly gives questions?

There are many good recommended books which you can refer for your preparation.

If you want to know about type of questions asked in the exam you should go through previous year papers. There are chances that you can get direct or type of question from there.

To score good marks in your exam it is very important that your concepts should be clear.

You can follow below books for your preparation

Physics
H.C Verma
D.C Pandey

Chemistry
Morrison Boyd
O.P. Tandon
R.C. Mukherjee
P.Bahadur
J.D. Lee

Mathematics R.D. Sharma
S.L. Loney
I.A. Maron
Hall and Knight

All the best for your preparation and your exam!!