I've seen many Xiangshan drum shots listed in grading books, including Liuyang River and Xiangshan drum shots. There should be some. Liuyang River is a symbolic tune to judge whether guzheng is an entry-level or not, which is a bottleneck. If you play well, it means that your left and right hands can play independently, which is very important. Although the mountains and rivers are well known, it seems that there are not many skills and it is not difficult.
I suggest you practice in every capital. You can't say for sure. If the teacher is on a whim, there is nothing he can do, but the chances are definitely Xiangshan and Liuyang River. It is estimated that there will be one in Liuyang River.
In addition, Shandandan is slightly more difficult as a fifth key. It used to be a seventh-grade key, but later it dropped, but it was still very difficult.