There are several case studies that have been frequently asked in previous years' exams. These case studies cover various fields such as economics, politics, environment, and social issues. Here are some examples:

1. Case Study: Land Acquisition Act, 2013
- This case study focuses on the Land Acquisition Act, which was enacted in 2013 in India.
- It examines the challenges faced by the government in acquiring land for development projects and the impact on the affected communities.
- The case study requires an analysis of the provisions of the Act, its implications, and possible alternatives to address the concerns of all stakeholders.

2. Case Study: Goods and Services Tax (GST)
- The GST case study explores the implementation of the Goods and Services Tax in India.
- It requires an understanding of the objectives, benefits, challenges, and impact of GST on various sectors of the economy.
- Candidates are expected to analyze the complexities of the tax structure, compliance issues, and the overall impact on economic growth.

3. Case Study: Climate Change and Sustainable Development
- This case study focuses on the global issue of climate change and its impact on sustainable development.
- It requires an analysis of the causes and consequences of climate change, as well as the measures taken by different countries to mitigate its effects.
- Candidates are expected to propose sustainable solutions to address climate change and promote sustainable development.

4. Case Study: Gender Equality and Empowerment
- This case study explores the challenges and opportunities for gender equality and empowerment in society.
- It requires an analysis of the social, economic, and political factors that contribute to gender inequality and the potential strategies to promote gender equality.
- Candidates are expected to propose measures to empower women and ensure their equal participation in all spheres of life.

5. Case Study: Cybersecurity and Data Protection
- This case study focuses on the growing concerns related to cybersecurity and data protection in the digital age.
- It requires an understanding of the various threats to cybersecurity, the legal and ethical issues surrounding data privacy, and the measures taken by governments and organizations to safeguard sensitive information.
- Candidates are expected to propose strategies to enhance cybersecurity and protect individuals and organizations from cyber threats.

These are just a few examples of the case studies that have been frequently asked in previous years' exams. It is essential to thoroughly understand the subject matter, analyze the given information, and provide well-reasoned solutions or recommendations in the answers.