There are several online communities and forums where you can find discussions on previous years' papers of the UPSC Law Optional subject. These platforms provide a space for aspirants to share their knowledge, ask questions, and engage in meaningful discussions related to the subject. One such platform is EduRev, which is a popular online learning community that offers a wide range of resources for UPSC preparation.

EduRev:
- EduRev is an online platform that provides access to a vast collection of study materials, including previous years' papers, notes, and practice questions for various subjects, including Law Optional for UPSC.
- It has a dedicated section for UPSC Law Optional, where aspirants can find previous years' papers, sample questions, and study materials.
- The platform allows users to ask doubts and get answers from experts and fellow aspirants, facilitating interactive discussions on specific topics or questions from previous papers.
- It also offers a feature called "Ask and Answer," where users can post their queries related to the subject, and other users can provide solutions or explanations.
- EduRev has a user-friendly interface that makes it easy to navigate and find relevant materials for UPSC Law Optional.

Other online communities and forums:
- Apart from EduRev, there are several other online communities and forums where you can find discussions on previous years' papers of UPSC Law Optional.
- Websites like Quora, Reddit, and various UPSC preparation forums have dedicated sections or threads where aspirants discuss the subject and share their insights on previous papers.
- These platforms also allow users to ask questions and get answers from experts or experienced candidates, making it a valuable resource for aspirants preparing for UPSC Law Optional.

Benefits of online communities and forums:
- Online communities and forums provide a platform for aspirants to connect with like-minded individuals who are preparing for the same exam.
- By participating in discussions, aspirants can gain different perspectives, learn new approaches, and enhance their understanding of the subject.
- These platforms also foster a sense of community and support, as aspirants can share their struggles, successes, and strategies with each other.
- Discussions on previous years' papers can help aspirants identify the patterns, trends, and important topics that are frequently asked in the exam.
- Overall, online communities and forums play a crucial role in supplementing self-study and providing a collaborative learning environment for UPSC Law Optional aspirants.