To develop reasoning abilities for the UPSC exam, candidates should engage in a variety of practices. Start with regular practice of logical reasoning and analytical reasoning exercises, such as puzzles and case studies. Solving previous years' question papers will familiarize candidates with the exam pattern and build confidence. Participating in discussions enhances critical thinking, while taking up competitive exams like CAT can provide rigorous training. Lastly, maintaining a habit of reflecting on and evaluating everyday arguments will sharpen reasoning skills essential for UPSC.