Aspirants should prioritize physical and human geography aspects in their UPSC preparation. Understanding physical geography includes concepts of landforms, climate, and natural resources, which shape the Indian landscape and its implications on society. Human geography covers population dynamics, urbanization, and cultural aspects, critical for comprehending national and regional policies. Candidates should also be aware of regional development issues, as these often appear in the prelims and mains papers, especially in the context of sustainable development and resource management.