What you should be talking about is not the grading test of the same school. The grading test of the Central Conservatory of Music is called basic music knowledge, and the grading test of the China Conservatory of Music is called music literacy. It is definitely different and not universal for different schools.

Although the names are different, the content is actually sight-singing and ear-training, music theory, and music theory knowledge. You can search for "I Love Music Exam Network", which is established by professional sight-singing and ear-training teachers. There is a lot of content for grading in this area.