Negative sentiment can significantly impact candidates during UPSC preparation by fostering feelings of self-doubt and anxiety. This emotional state can diminish one's focus and motivation, leading to a drop in performance. Negative self-talk or external criticisms may cause candidates to feel demotivated, affecting their consistency in study routines. It's essential for candidates to engage in positive reinforcement and surround themselves with supportive peers or mentors. Practicing mindfulness and stress management techniques can alleviate pressure, maintaining mental well-being throughout the rigorous preparation phase.