Personal interests should align with subject selection in UPSC preparation to foster intrinsic motivation and engagement. When aspirants choose subjects they are passionate about, they are likely to invest more time and effort. For example, someone interested in politics might focus on political science and public administration, enhancing understanding and retention. Conversely, selecting subjects purely for their scoring potential without interest may lead to disinterest and burnout. Aligning personal interests with study topics not only makes preparation enjoyable but also deepens knowledge, contributing to comprehensive learning.