Effective group study techniques for UPSC preparation include structured discussions, peer teaching, and mock interviews. Structured discussions help clarify doubts and reinforce learning through collaborative dialogue. Peer teaching allows candidates to explain concepts to each other, solidifying their own understanding while benefiting others. Mock interviews can simulate the actual personality test experience, offering feedback and reducing anxiety. Additionally, maintaining a focused agenda and respecting each member's time is crucial for maximizing productivity. Constant communication and revision of subjects studied collectively assist in maintaining clarity and motivation among group members.