Effective group study techniques for UPSC preparation include assigning roles based on each member's strengths to cover a wider range of topics. Regular study sessions allow for the sharing of resources and different perspectives on complex subjects. Engaging in quiz sessions can enhance retention and understanding while fostering a competitive yet collaborative environment. Furthermore, periodic assessments within the group help identify knowledge gaps and areas for improvement. Group members should maintain regular communication for motivation and support, ensuring a structured and goal-oriented study approach.