Mock testing is critical in UPSC exam preparation as it simulates the actual exam environment and conditions. It helps candidates in time management, familiarizing them with the exam pattern and structure. By taking regular mock tests, aspirants can assess their knowledge, identify strengths and weaknesses, and adapt their preparation strategies accordingly. Additionally, it builds confidence and alleviates exam-related anxiety. Mock tests also provide a feedback mechanism, allowing candidates to focus on problematic topics and improving their performance through targeted revisions based on performance analysis.