Sustained practice is crucial in mastering UPSC subject matter, as it helps in solidifying knowledge and enhancing retention. Engaging in regular revision and solving past papers reinforces concepts and develops time management skills critical for exam success. Furthermore, consistent practice helps aspirants identify their strengths and weaknesses, allowing for targeted improvement. Overall, dedicating time to deliberate practice fosters a deeper understanding of the syllabus and cultivates the analytical skills necessary for complex UPSC questions.