Questions are moderate to hard, moreover, no such questions are directly asked, but, applied one.
Questions are asked based on the in depth understanding of the subject whether it is geography, history, polity, economy, S&T, etc. Some of the questions can be solved through elimination method however, some need to stop and think approach.
Questions in history are not exactly based on the historical events, esp. culture and ancient history part. Modern history - national movement questions are direct and easy to solve. One question on location of sites is asked in the correlation with g
3 questions from sports asked for the first time in the last 20 years
Direct questions from Polity NCERT (class 11 and 12. For example: Constitutional government, Constitutional status of India in 1950, Devi Lal, essential features that indicates India's federal character.
Environment questions have a bent towards traditional knowledge. Basic understanding of phylums, symbiotic relationships etc has more focus. And the trend has been the same like more focus on the big organisations like UNEP, UNFCCC etc...