Last-minute preparation tips for UPSC candidates include conducting quick revision of important topics, clarifying doubts, and practicing answer writing under timed conditions. Candidates should focus on their strengths while ensuring they cover essential current affairs. Taking care of physical and mental well-being through adequate rest and nutrition is crucial in these final stages. Engaging in mock interviews or group discussions can help boost confidence. Finally, approaching the exam with a positive mindset and avoiding stress can enhance performance, enabling candidates to effectively articulate their knowledge.