Best strategies for last-minute revision before the UPSC exams include creating a focused and structured revision plan that prioritizes high-yield topics from the syllabus. Candidates should review previous years' question papers to identify recurring themes and areas of importance. Utilizing concise notes, flashcards, and summaries can facilitate quick recall of key concepts. Balancing time between subjects and practicing mock tests helps reinforce learning under exam conditions. Additionally, maintaining a calm and composed mindset, along with adequate rest, is crucial for optimizing performance during the examination.