To prepare effectively for the Public Administration optional subject in UPSC, candidates should focus on comprehending core theories and principles. Studying classical and contemporary authors is essential for grasping the subject's evolution. Regularly practicing previous years’ questions can help in understanding the exam pattern and expected answer format. Engaging in discussions with peers can clarify complex concepts and provide diverse perspectives. Additionally, integrating case studies and real-world examples can enhance analytical responses. Continuous revision and connecting public administration principles with current events can further solidify understanding.