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Sending ducks symbolizes the first place in the imperial examination.
"A" is homophonic with "duck". In folk art, ducks are often depicted swimming on the water, with reeds or crab claws beside them, which means they move in the middle. Folklore also tells that ducks or crabs are given to travelers for a bright future.
China adopted the Imperial Examination since the Sui Dynasty? . Exams are graded, such as county exam, general exam and palace exam. In the Ming and Qing dynasties, after passing the highest court examination, it was divided into three grades, namely, the top three, which were named champion, second place and flower exploration respectively. "One for one" is the champion.