Candidates should possess a thorough understanding of diplomatic relations for UPSC, as it's integral to both the General Studies syllabus and the role of civil servants. Key aspects include grasping international treaties, bilateral relations, and regional conflicts. Awareness of India's foreign policy priorities and participation in global organizations showcases a candidate's analytical and strategic thinking skills. Additionally, candidates must keep abreast of current global events, which can be tested in both prelims and mains. Such knowledge equips future civil servants to effectively navigate and address international challenges and policy decisions that may arise.