The significance of having a mentor during UPSC preparation lies in the guidance and structured approach they provide. A mentor can share valuable insights, strategies, and resources, helping aspirants navigate the vast syllabus effectively. They can also help identify strengths and weaknesses, allowing for a more tailored study plan. Furthermore, mentors can offer emotional support, keeping candidates motivated and accountable throughout the rigorous preparation process. Their experience and perspective can create a more efficient learning path, ultimately increasing the chances of success in the highly competitive UPSC exams.