Effective strategies for revising the vast syllabus of the UPSC examination include creating a systematic revision schedule that prioritizes subjects based on difficulty. Utilizing summaries and notes is essential for reinforcing key concepts and improving retention. Candidates should practice past year question papers to familiarize themselves with the exam pattern and identify important topics. Regular assessments through mock tests can also highlight weak areas needing attention. Engaging in thematic revisions that tie subjects together enhances memory associations, making recall easier during the exam.