Yes, there is an online platform called EduRev where you can discuss previous years' papers for the Civil Engineering optional subject with experienced faculty. EduRev is a popular e-learning platform that provides a wide range of study materials, practice questions, and discussion forums for various competitive exams, including the UPSC Civil Services Examination.

Discussion Forums:
EduRev has a dedicated section for discussion forums where students can ask questions, clarify doubts, and engage in discussions related to various subjects, including Civil Engineering. The platform allows students to interact with experienced faculty members, who can provide valuable insights and guidance regarding previous years' papers, exam patterns, and important topics. Students can post their questions or browse through existing discussions to find answers to their queries.

Experienced Faculty:
EduRev ensures that the discussion forums are monitored by experienced faculty members who specialize in Civil Engineering. These faculty members have in-depth knowledge of the subject and are well-versed with the UPSC exam pattern. They can provide accurate and reliable information, guidance, and tips to help students understand the previous years' papers and prepare effectively for the exam.

Study Materials:
In addition to the discussion forums, EduRev also offers a comprehensive collection of study materials for the Civil Engineering optional subject. These study materials include notes, practice questions, previous years' papers, and mock tests. Students can access these resources to enhance their understanding of the subject and improve their exam preparation.

Benefits of Using EduRev:
- Interactive discussion forums to engage with experienced faculty members.
- Access to a wide range of study materials, including previous years' papers.
- Regular updates and notifications regarding important topics and exam patterns.
- Opportunities to connect with fellow aspirants and learn from their experiences.
- User-friendly interface and easy navigation for a seamless learning experience.
- Availability of EduRev mobile app for convenient access to study materials and discussions on the go.

In conclusion, EduRev is a reliable and comprehensive online platform that offers discussion forums, study materials, and guidance from experienced faculty members for the Civil Engineering optional subject. It provides an interactive and collaborative learning environment for UPSC aspirants to discuss previous years' papers and prepare effectively for the exam.