There are six sections in Paper I of the Public Administration optional for the UPSC exam. Let's explore each section in detail:

1. Introduction:
The introduction section provides an overview of the subject and its significance in the context of public administration. It gives an understanding of the basic concepts, theories, and approaches related to public administration.

2. Administrative Thought:
This section focuses on the evolution of administrative thought and the contributions of various scholars and thinkers. It covers the classical, modern, and post-modern perspectives of public administration. Key points may include:

- Classical theories: Contributions of Max Weber, Woodrow Wilson, and Frederick Taylor.
- Modern theories: Contributions of Herbert Simon, Dwight Waldo, and Elton Mayo.
- Post-modern theories: Contributions of Fred Riggs, Herbert Kaufman, and Charles Lindblom.

3. Comparative Public Administration:
In this section, the comparative study of public administration in different countries is explored. It examines the similarities and differences in administrative systems, structures, and practices. Key points may include:

- Comparative analysis of administrative systems in developed and developing countries.
- Comparative study of bureaucracy, decentralization, and public policy implementation.
- The role of international organizations in shaping public administration.

4. Development Administration:
Development administration focuses on the role of public administration in facilitating and promoting socio-economic development. Key points may include:

- The concept of development administration and its evolution.
- The relationship between bureaucracy and development.
- Public sector reforms and their impact on development administration.

5. Public Policy:
This section deals with the formulation, implementation, and evaluation of public policies. It explores the policy-making process, policy analysis, and the role of different actors in policy formulation. Key points may include:

- Theories of public policy-making, such as the incremental model and the advocacy coalition framework.
- Policy implementation challenges, including coordination, capacity-building, and accountability.
- Policy evaluation techniques and their significance in improving policy outcomes.

6. Techniques of Administrative Improvement:
This section focuses on the tools and techniques used to improve administrative efficiency and effectiveness. It covers topics such as organizational development, decision-making, and administrative reforms. Key points may include:

- Techniques of organizational diagnosis and change management.
- Approaches to decision-making, including rational and incremental models.
- Administrative reforms, such as citizen-centric service delivery and e-governance.

In conclusion, Paper I of the Public Administration optional for the UPSC exam is divided into six sections: Introduction, Administrative Thought, Comparative Public Administration, Development Administration, Public Policy, and Techniques of Administrative Improvement. Each section covers different aspects of public administration, providing a comprehensive understanding of the subject.