Case studies are essential in the UPSC preparation strategy as they provide real-world examples that demand practical application of theoretical knowledge. They encourage aspirants to analyze situations, understand cause and effect, and formulate actionable solutions. This method fosters critical thinking and prepares candidates to tackle complex questions during the exam. Furthermore, discussing case studies can enhance retention of information, stimulate engagement, and improve the ability to present structured arguments, all of which are vital in the UPSC exams.