If your grades are not good, then learn your grades first. Professional colleges are more formal and can receive systematic training, allowing you to make more professional music. At the same time, the atmosphere in the school will encourage you to work hard to create. If you are an independent musician, it is best to apply for the Department of Music Production, which specializes in song creation and midi production.

If you don’t pass the exam and you really want to be an independent musician, you can do it, but it will be a very difficult learning period. I hope you can persevere.

There are many ways to self-study, not just books, but also many forums, such as midifan, arranger China, Liu Hanzhong's website, etc. You can meet many people who are helpful to you. Many independent musicians came out of it by struggling in it.

Let me give you an outline. You have learned guitar, music theory, and audition singing, which should be pretty good. For arranging, it is better to learn keyboard, which will be more convenient in the future. Re-learning music theory, mainly focusing on the aspects of arranging, such as harmony and orchestration. There are many online books and videos. The more you learn the basics, at least you will not make music theory mistakes.

Next, learn the host software, Cubase neundo sonar pro tools and other mainstream arrangement software. These tutorials are everywhere on the Internet, which is enough for you to learn by yourself.

Then learn the operations and techniques of various soft sound sources, instruments such as ivory bfd, and then the use of effects such as waves, and then you can produce works. As for independent musicians, there are very few who are famous. Why do they persist because they love music!