This is a textbook that can complete all music theory, and it consists of a total of 3 volumes.
It consists of a variety of problem types and a large number of questions, so it can be used to prepare for music exams in upper elementary school or middle and high school.
It is structured in the order of music theory, general summary problems, and in-depth learning, allowing for systematic learning.
There is a break corner provided after intensive study, so you can study without getting bored.