What was the focus of the civil service examinations for the state bureaucracy under the Tang?

The officials selected by writing exams as it gave a chance to candidates for governing the state under the bureaucracy.

Explanation:

The civil service examinations allowed the state to find the best candidates to serve the bureaucracy under the Tang that governed China in 618 CE. Empress Wu Zetian of the Tang Dynasty regularly depended on the imperial examinations for selecting officials. The civil service exam was a practice of examining male candidates who yearned to enter the Imperial Court to serve the bureaucracy.  

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