Answer :
Choe Chiwon studied for many years in Tang China, passed the Tang imperial examination, and rose to the high office there before returning to Silla, where he made ultimately futile attempts to reform the governmental apparatus of a declining Silla state.
The examination system was the common method of selecting candidates for state offices. A civil service examination system in Imperial China designed to select the best potential candidates to serve as administrative officials. It was created during the Tang period and became during the Song period the prevalent form of choosing appointees. It was the regular path into officialdom, in contrast to irregular ways like the purchase of a student status.
Choe Chiwon passed the Tang imperial examination, and rose to the high office.
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