Aspirants can measure their progress during UPSC preparation by setting specific goals, evaluating their performance in mock tests, and maintaining a study journal. Regularly assessing strengths and weaknesses through self-assessment tests helps identify areas needing improvement. Engaging in group discussions and peer assessments also promotes accountability and gives different perspectives on performance. Additionally, tracking completion of topics and revision of syllabus can provide a tangible sense of advancement. This methodical approach ensures candidates stay aligned with their preparation timeline and make necessary adjustments.