Here I am giving you some preparation tips for Indian administrative service examination of UPSC Below..

You should start preparation start as soon as possible. First of all you must know complete syllabus and exam pattern of Indian administrative service examination.. You must give at least 12 to 14 hours per day for studies..

Then you have to give more attention for important topics of Indian administrative service examination . You have to make notes for important topics of Indian administrative service examination and revised them regularly.

For better preparation you have to solve the previous year question paper of Indian administrative service examination or you can buy books for it

Best books for IAS exam :
Data Interpretation and Data Sufficiency by Tyra and Kundan
Objective General English by R.S. Agarwal
A Modern Approach to Verbal Reasoning by R.S. Agarwal
A new Approach to Reasoning by Sijwali and Sijwali
An Introduction to the Constitution of India by D.D. Basu