[TOMT][HISTORY][Chinese/Japanese] Name of a challenging final test a scribe would take to prove themselves.

I remember reading about this in a book as a kid, in the You Wouldn't Want To Be a _____ series.

Apparently there was some sort of multi-day exam wherein scribes would be locked in a room for 3-4 days, and were expected to reproduce all unique characters in the more than 50,000 character language. Not sure if that number is accurate, but you get the idea. Lots of memorization for them.

The other details I remember was that the scribe had to provide their own food, ink, and parchment. And that the stakes and cost was so high, that they would oftentimes write a cheat sheet on the inside of their clothes to help them with some of the tricker characters.