My calligraphy grade test results show that it is "Advanced Band 6". I took the first grade exam, and I don't know what the advanced level of hard pen calligraphy is.

I don't know where you are, my dear friend. The number of grades set in different places is also different. Some places are nine, some places are ten, and some places are six. It mainly depends on your regulations there. If you want calligraphy to reach a new level, you should not only practice more, but also observe and appreciate the works of some award-winning masters. We must reach eye height and hand height at the same time.