Candidates can combat mental fatigue during UPSC preparation through various strategies. Regular breaks, physical exercise, and adequate sleep are crucial for maintaining cognitive function. Techniques such as mindfulness, meditation, or engaging in hobbies can also provide mental relief. Time management is essential; adopting the Pomodoro technique, which alternates study sessions with short breaks, can enhance focus and reduce exhaustion. Furthermore, setting realistic, attainable study goals fosters a sense of accomplishment, thereby mitigating feelings of overwhelm.