The most effective ways to revise the UPSC syllabus include regular reviews, mock tests, and focused revisions using summary notes. Creating a structured timetable helps in covering all topics systematically. Incorporating techniques such as spaced repetition and the Feynman technique can aid memory retention. Completing previous year question papers and solving sample papers can familiarize aspirants with the exam pattern. Engaging in group discussions for different subjects helps in clearing doubts and reinforcing knowledge. Continuous evaluation of performance can pinpoint areas needing reinforcement during revision.