**Why are previous years' question papers important for UPSC preparation?**
Previous years' question papers are crucial for UPSC preparation as they offer insights into the exam's pattern, frequently covered topics, and the style of questioning. Analyzing these papers helps candidates understand the level of difficulty and assess their preparedness. They also provide a benchmark for time management, allowing aspirants to practice mock tests under timed conditions. Furthermore, solving past questions enhances retention of important concepts and familiarizes candidates with the types of analytical skills required for success. Regular practice of these papers can significantly improve performance.