When selecting a mentor for UPSC preparation, candidates should consider the mentor’s knowledge and experience with the UPSC exam pattern and syllabus. A good mentor should have a track record of guiding successful aspirants and understanding the various nuances of the exam, including both Preliminary and Mains. Accessibility is also crucial; a mentor should be available for guidance during challenging phases. Additionally, candidates should seek someone who encourages independent thought and supports personal growth rather than merely providing answers, thus fostering a more enriching learning experience.