Mock tests hold significant importance for the Preliminary Examination as they provide a realistic simulation of the exam environment. They help candidates familiarize themselves with the exam format, including the types of questions asked. Regularly taking mock tests allows students to practice time management, a crucial skill for success in the exam. Furthermore, these tests can highlight areas needing improvement, enabling targeted revision. They can also enhance confidence levels as candidates improve their performance over time, making them an invaluable tool in effective UPSC preparation.