This document provides a breakdown of topics covered in civil services examinations from 2010 to 2012. It shows the percentage and number of questions asked from each topic each year. History, polity, and environment and biodiversity comprised the largest shares. The document also lists sub-topics covered under key subjects like history, polity, geography, economy, science and technology, and current affairs. It provides sample questions asked from each subject and encourages readers to start preparing for the main exam after taking the preliminary exam.