Candidates can effectively utilize previous years’ question papers for UPSC preparation by analyzing patterns in questions and understanding the exam's structure. Regularly practicing these papers can familiarize candidates with the format and types of questions asked, thus enhancing their confidence and time management skills during the actual exam. This exercise also helps in identifying frequently covered topics and assessing weak areas that require more attention. By simulating exam conditions while practicing, candidates can improve their answer-writing speed and clarity, ensuring they are better prepared.