The civil service exams in China contributed to the success and stability of China throughout the Middle Ages by selecting individuals with the knowledge and skills necessary for government positions. By using these exams, the government was able to ensure that the officials in charge of governance were well-educated and capable of fulfilling their duties. Additionally, the exams provided a merit-based system for selecting officials, rather than relying on family connections or wealth. This helped to prevent corruption and nepotism in government, and ensured that the best-qualified individuals were in positions of power. Furthermore, the test also helped to select people who are efficient and can work quickly to accomplish tasks which is important for the smooth running of the government. Thus, it was an effective way to ensure that the government was staffed by capable, qualified officials who were dedicated to serving the people.