I passed grade b, which is not very difficult. The process of class b is probably

Everyone is sitting in his seat, holding a test paper. The teacher speaks a standard note A on the piano in front, and then plays a different note. You need to write this sound down. There seem to be eight questions.

Then the teacher began to beat the rhythm with his voice, which was about four questions. Listen to each question three times and you need to write down the rhythm.

All that remains is for you to write a test. There are probably chords, syllables, triplets and so on (all the students who copied my answers in pass passed, and the rest passed a big block)

I hope it works for you!