Memorizing vast syllabi for UPSC requires effective study techniques and time management. Breaking down the syllabus into manageable sections and using methods like mnemonics, visual aids, and mind mapping can enhance retention. Regular revision is crucial to reinforce memory; using a spaced repetition approach can improve recall. Additionally, active learning strategies, such as summarizing information in one's own words or teaching concepts to others, can also aid memorization. Lastly, maintaining a consistent routine and ensuring breaks can prevent burnout and enhance overall efficiency in grasping extensive content.