Case studies in UPSC Mains preparation are significant as they offer candidates a practical understanding of theoretical concepts. They help develop analytical skills by requiring students to examine real-world scenarios, identify key issues, and provide solutions. Incorporating case studies enhances critical reasoning and helps candidates apply their knowledge in policy-making situations. This practice also aids in enhancing the writing style, enabling candidates to present arguments coherently and convincingly in the exam, thereby increasing the chances of scoring well.