Best practices for interacting with peers while preparing for UPSC include establishing study groups to facilitate knowledge exchange and collaborative learning. Peer discussions promote diverse viewpoints and critical thinking, which can enhance understanding of complex issues. It is important to maintain a positive and supportive environment, encouraging constructive feedback. Sharing resources, quiz challenges, and mock interviews within the group can foster a competitive yet collaborative spirit. Additionally, setting mutual goals can help keep all members accountable and motivated throughout the preparation process.