Preparing for case study questions in the psychology optional exam can be challenging, as it requires a deep understanding of concepts, theories, and practical applications. However, there are several resources and references that can help you in your preparation:

1. Textbooks:
- "Psychology" by Ciccarelli and White: This comprehensive textbook covers various topics in psychology, including case studies, research methods, and theories.
- "Case Studies in Abnormal Psychology" by Thomas F. Oltmanns and Michele T. Martin: This book provides real-life case studies that can help you understand how psychological disorders are diagnosed and treated.

2. Academic Journals:
- "Journal of Abnormal Psychology": This journal publishes articles and case studies related to abnormal psychology, providing insights into the assessment, diagnosis, and treatment of psychological disorders.
- "Journal of Experimental Psychology: Applied": This journal focuses on the application of psychological research in real-world settings, which can be beneficial for understanding case study questions.

3. Online Resources:
- EduRev: This online learning platform offers a wide range of study materials, including notes, quizzes, and case studies in psychology. It is a valuable resource for UPSC exam preparation.
- American Psychological Association (APA) website: The APA provides resources such as articles, guidelines, and case studies that can enhance your understanding of various psychological concepts.

4. Previous Year Question Papers:
- Solving previous year question papers will give you an idea of the type of case study questions asked in the exam. It will help you familiarize yourself with the format and structure of the questions.

5. Study Groups and Discussion Forums:
- Joining study groups or online discussion forums can be beneficial as you can exchange ideas and learn from peers who are also preparing for the psychology optional exam. Discussing case studies with others can provide different perspectives and enhance your critical thinking skills.

Remember to practice analyzing case studies and formulating well-reasoned responses. Develop a systematic approach to understanding the background, identifying key issues, applying relevant theories, and providing evidence-based conclusions. Regular practice, along with the above-mentioned resources, will help you excel in case study questions in the psychology optional exam.