Case studies play a crucial role in preparing for the Ethics paper in UPSC by illustrating real-life scenarios where ethical principles are applied. They aid candidates in understanding complex ethical dilemmas and enhance their ability to analyze situations critically. Through case studies, aspirants learn to develop well-rounded responses by integrating ethical theories and their own values. This practical approach not only helps in answering descriptive questions effectively but also prepares candidates for situational questions during interviews, where ethical reasoning is vital.