To excel in the public administration optional subject for UPSC, candidates should focus on understanding key concepts and theories relevant to governance and administration. Effective preparation involves a thorough review of the syllabus, followed by strategic reading of recommended texts, case studies, and current affairs related to public administration. Regular self-assessment through previous years' question papers can identify important themes and trending topics. Joining study groups can also enhance learning through discussion and diverse viewpoints. Additionally, candidates should ensure a clear grasp of administrative frameworks and policies in India, integrating practical examples into their answers.