Selecting a subject with an overlapping syllabus for UPSC offers several advantages. It allows for more efficient study since candidates can cover multiple topics simultaneously, reducing overall preparation time. For instance, subjects like Geography and Environment may share significant content. This strategy also helps in reinforcing knowledge, as revisiting similar concepts across different subjects enhances retention. Moreover, having a solid grasp of related areas boosts confidence and prepares candidates for interdisciplinary questions in both the Prelims and Mains.