Personal interests significantly influence optional subject selection in UPSC exams, as candidates are more inclined to choose subjects they are passionate about or have a background in. This alignment boosts motivation and facilitates deeper engagement with the content, often leading to better performance. Prior knowledge in a subject can enhance comprehension and retention, key factors in mastering complex concepts. Additionally, interesados can create a more personalized study plan tailored to their interests, which fosters a more enjoyable learning experience. Ultimately, selecting an optional subject based on personal interests can significantly enhance a candidate's preparedness and confidence during the examination.