Introduction:
Reviewing the solutions of previous year papers can be extremely beneficial for refining one's approach to handling case study-based questions in Public Administration. It provides insights into the pattern of questions, the expected depth of analysis, and the approach to be followed while answering such questions. By thoroughly analyzing the solutions, candidates can enhance their understanding of the subject matter and develop effective strategies to tackle similar questions in the future.

Identification of key concepts:
1. Understanding the question requirements
2. Analyzing the case study
3. Applying relevant theories and concepts
4. Developing a logical and structured approach
5. Identifying strengths and weaknesses in the answers

Explanation:
1. Understanding the question requirements: Reviewing previous year papers helps in understanding the type of questions that are commonly asked in Public Administration case studies. It enables candidates to identify the specific requirements of the question, such as analyzing the given scenario, suggesting solutions, or evaluating the effectiveness of policies.

2. Analyzing the case study: Case studies often present complex scenarios that require a comprehensive understanding of the subject matter. By reviewing previous year solutions, candidates can learn how to effectively analyze the given case study, identify the key issues, and prioritize the information relevant to the question.

3. Applying relevant theories and concepts: Public Administration is a theoretical subject that requires the application of various theories and concepts to real-life scenarios. By reviewing previous year solutions, candidates can learn how to effectively apply the relevant theories and concepts to case study questions. This helps in developing a deeper understanding of the subject matter and enhances the quality of their answers.

4. Developing a logical and structured approach: Case study-based questions often require candidates to provide a logical and structured analysis of the given scenario. By reviewing previous year solutions, candidates can learn how to develop a systematic approach to answer such questions. They can understand the importance of providing a clear introduction, organizing the answer into sections, and using appropriate headings and subheadings.

5. Identifying strengths and weaknesses in the answers: Reviewing previous year solutions allows candidates to identify the strengths and weaknesses in the answers provided by successful candidates. This helps in understanding the expectations of the examiners and enables candidates to enhance their own answers accordingly.

Conclusion:
Reviewing the solutions of previous year papers is a valuable exercise for candidates preparing for case study-based questions in Public Administration. It helps in understanding the question requirements, analyzing case studies, applying relevant theories and concepts, developing a logical approach, and identifying strengths and weaknesses in the answers. By incorporating the insights gained from these reviews, candidates can refine their approach and increase their chances of success in the examination.