R Section of Paper I in UPSC covers the topic of "Indian Economy and Issues Relating to Planning, Mobilization of Resources, Growth, Development, and Employment". This section is designed to assess the candidate's knowledge and understanding of the various aspects of the Indian economy, including its planning, resource mobilization, growth, development, and employment. Here are the main topics covered in Section R:

1. Planning in India:
- Five-Year Plans: The candidate should be familiar with the objectives, achievements, and challenges of different Five-Year Plans implemented in India.
- NITI Aayog: Understanding the role and functions of NITI Aayog, its significance in the planning process, and its difference from the erstwhile Planning Commission.

2. Mobilization of Resources:
- Taxation: Knowledge of various taxes levied in India, such as direct and indirect taxes, their purpose, and their impact on the economy.
- Fiscal Policy: Understanding the concept of fiscal policy, its components, and its role in regulating the economy.
- Monetary Policy: Familiarity with the objectives, instruments, and impact of monetary policy on the Indian economy.
- Public Finance: Knowledge of government revenue and expenditure, budgeting process, and fiscal deficit.

3. Economic Growth and Development:
- Gross Domestic Product (GDP): Understanding the concept of GDP, its measurement, and its significance in assessing economic growth.
- Economic Sectors: Knowledge of the primary, secondary, and tertiary sectors of the economy and their contribution to GDP.
- Economic Reforms: Understanding the economic reforms initiated in India since independence, such as liberalization, privatization, and globalization, and their impact on the economy.
- Sustainable Development: Familiarity with the concept of sustainable development, its importance, and the challenges associated with achieving sustainable growth.

4. Employment and Unemployment:
- Employment Generation: Knowledge of the various government schemes and initiatives aimed at promoting employment generation in India.
- Unemployment: Understanding the types and causes of unemployment, their implications, and the measures to address the issue.
- Skill Development: Awareness of the skill development programs and initiatives undertaken by the government to enhance employability.

In conclusion, Section R of Paper I in UPSC covers a wide range of topics related to the Indian economy, including planning, resource mobilization, growth, development, and employment. It is crucial for candidates to have a comprehensive understanding of these topics to perform well in this section.