There are various online platforms and apps that can be used to access and study Economics Optional case studies. These platforms provide a convenient way to access a wide range of case studies, allowing students to enhance their understanding of economic concepts and theories.

1. EduRev: EduRev is an online learning platform that offers a comprehensive collection of case studies for Economics Optional. It provides a user-friendly interface and allows students to access case studies on various topics such as macroeconomics, microeconomics, international economics, etc. EduRev also offers features like discussion forums and study materials to further enhance the learning experience.

2. Mobile Apps: There are several mobile apps available for studying Economics Optional case studies. These apps provide easy access to case studies on-the-go, allowing students to study anytime and anywhere. Some popular apps include UPSC IAS All in One App, BYJU'S - The Learning App, and Unacademy Learning App. These apps offer a vast collection of case studies, video lectures, quizzes, and practice questions to help students grasp the concepts effectively.

3. Online Forums and Discussion Groups: Apart from dedicated platforms and apps, online forums and discussion groups can also be a valuable resource for accessing case studies. Websites like Quora and Reddit have dedicated communities where students and experts discuss and share case studies related to Economics Optional. These platforms allow students to interact, ask questions, and gain insights from others' experiences.

4. Online Libraries: Many universities and institutions have digital libraries where students can access case studies related to Economics Optional. These libraries often provide access to a vast collection of resources, including case studies, research papers, and journals. Some notable online libraries include JSTOR, Google Scholar, and Open Access Digital Library.

In conclusion, online platforms and apps offer a convenient and accessible way to access and study Economics Optional case studies. These platforms provide a wide range of resources, including case studies, study materials, video lectures, and discussion forums, to aid in the learning process. By utilizing these resources effectively, students can enhance their understanding of economic concepts and theories, ultimately improving their performance in the Economics Optional examination.