How did the civil service system change during china's government?

The civil service system change during China's government to stop the practice of having only members from royal family members and other aristocrats run the government.

Emperor Han Wudi introduced the imperial Civil service examination the examination made it so ordinary people with talent, ability and dynamic talent could work in government and it is a common examination for all not only for the aristocrats or the people who have connections.

where is the passage

answer; avoiding style;