Below is the list of books that can help u to crack public administration in civil services-

•Public Administration Theory and concepts - Rumki Basu

•Public Administration (Manual) (TATA MC Graw Hill) - Laxmikanth.

•Public Administration —Mohit Bhattacharya

•Public Administration in Theory and Practice—M.P. Sharma & B.L. Sadana

•Public Administration —A.R. Tyagi

•Administrative Thinkers —Prasad & Prasad

•Introduction to the Study of Public Administration —L.D. White

•Public Administration —Avasthi & Maheshwari