Mentorship plays a crucial role in effective UPSC exam preparation by providing guidance, accountability, and emotional support to aspirants. Experienced mentors can offer test strategies, suggest study resources, and share their personal success stories, which can motivate candidates. Additionally, mentors help in identifying strengths and weaknesses, allowing aspirants to tailor their preparation more effectively. Engaging in regular discussions about different subjects with a mentor can also foster a deeper understanding and better retention of complex concepts.