Logical reasoning skills significantly impact UPSC exam success by enhancing critical thinking and problem-solving abilities. Strong reasoning allows candidates to dissect complex problems and formulate coherent arguments. It is vital in tackling decision-making questions and analyzing current affairs effectively. In essay writing, reasoning skills help articulate points clearly and persuasively. Engaging in puzzles and analytical exercises during preparation further sharpen these skills, fostering a balanced approach to multiple-choice questions and subjective responses during the exam.