Crack Police Service by Lila Roy book is one of the best books for WB Police Preliminary and Main Exam. It not only helps to gather knowledge about General Studies for all exam but also have some practice sets to update practice experience on various exams like WBCS, WBP, SSC, Railway, Banking, WBPSC and many other recruitments. All parts contain previous year questions of WB Police and Central Police Exams.