There are several online platforms where you can discuss the solutions of previous years' papers of UPSC Management optional subject with other aspirants. Here are some popular platforms:

1. EduRev:
- EduRev is a comprehensive online learning platform that offers a wide range of resources for UPSC Management optional subject.
- It provides a dedicated section for discussions where aspirants can post their queries and discuss solutions with other students.
- The platform is user-friendly and allows easy navigation through various topics and threads.
- EduRev also offers study materials, video lectures, and practice questions to supplement your preparation.

2. UPSC Forums:
- There are several UPSC forums available online where you can find dedicated sections for discussing different optional subjects, including Management.
- These forums provide a platform for aspirants to interact with each other, share their insights, and discuss the solutions of previous years' papers.
- UPSC forums are usually divided into different sections for each subject, making it easier to navigate and find relevant discussions.
- Some popular UPSC forums include UPSC Pathshala, Civil Services India, and ForumIAS.

3. Telegram Groups:
- Telegram has gained popularity as a platform for UPSC aspirants to connect and share their knowledge.
- There are numerous Telegram groups specifically dedicated to UPSC Management optional subject.
- These groups allow you to join a community of aspirants, discuss previous years' papers, share study materials, and seek clarifications.
- To find relevant Telegram groups, you can search for keywords like "UPSC Management optional" or "UPSC Management discussion" on the Telegram app.

4. Social Media Groups:
- Social media platforms like Facebook and WhatsApp also have groups and communities where UPSC aspirants come together to discuss various subjects.
- You can search for UPSC Management optional groups on Facebook or join WhatsApp groups where aspirants actively discuss the subject.
- These groups provide a platform for sharing insights, discussing solutions, and seeking guidance from fellow aspirants.

Remember to engage actively in these platforms, ask questions, and contribute to discussions to maximize your learning and understanding of the subject. However, it's important to verify the credibility of the information shared and rely on official sources for accurate and updated content.