Yes, there are several online platforms where you can discuss previous years' papers for the Civil Engineering optional subject with other aspirants. These platforms provide a space for candidates to engage in discussions, share insights, and seek clarifications on various topics related to the exam. One such platform is EduRev.

Below are some key features of EduRev which make it an ideal platform for discussing previous years' papers for the Civil Engineering optional subject:

1. Vast Question Bank:
EduRev has a vast collection of previous years' papers for the Civil Engineering optional subject. These papers are categorized year-wise, making it easier for aspirants to access and discuss specific papers. The platform also allows users to upload and share their own question papers, thereby expanding the available question bank.

2. Discussion Forums:
EduRev provides discussion forums where aspirants can interact with each other and discuss specific questions or concepts from previous years' papers. Users can post their queries, share their solutions, and engage in healthy debates. This feature promotes peer learning and helps candidates gain a deeper understanding of the subject.

3. Expert Contributions:
EduRev has a team of subject matter experts who actively contribute to the platform. These experts provide detailed explanations, tips, and shortcuts for solving questions from previous years' papers. Their inputs help aspirants to improve their problem-solving skills and enhance their overall exam preparation.

4. Performance Analysis:
The platform offers performance analysis tools that allow users to assess their strengths and weaknesses in different topics. By analyzing their performance in previous years' papers, aspirants can identify the areas where they need to focus more and improve their overall preparation strategy.

5. User-friendly Interface:
EduRev provides a user-friendly interface that makes it easy for aspirants to navigate through the platform, access the relevant papers, and actively participate in discussions. The platform also offers mobile apps, enabling candidates to engage in discussions on the go.

In conclusion, EduRev is an excellent online platform for discussing previous years' papers for the Civil Engineering optional subject. Its vast question bank, discussion forums, expert contributions, performance analysis tools, and user-friendly interface make it a valuable resource for aspirants preparing for the UPSC exam.