If you already have a college degree, you can take the postgraduate exam directly at the university. If it is not enough, you need to take the same academic level. There is nothing difficult to measure with your art education.

However, as an unpopular art discipline like calligraphy, apart from becoming a professional calligrapher, there is no corresponding job. Many undergraduate and graduate students majoring in calligraphy have not found suitable jobs after graduation.

I suggest you take calligraphy as a deep-seated hobby, master a skill and cultivate your sentiment.