The significance of time-based mock tests during UPSC preparation lies in their ability to simulate real exam conditions. These tests help candidates manage time efficiently, ensuring they can complete papers within stipulated limits. Regular practice with mocks fosters familiarity with the exam format and type of questions, reducing anxiety on the actual day. Analyzing performance in mock tests identifies strengths and weaknesses, guiding targeted revisions. Additionally, timed practice enhances writing speed and clarity, crucial for writing coherent answers efficiently. Overall, integrating mock tests into preparation strategies greatly improves candidates' readiness for the examination.