B what I said above is the unified examination in society. Sometimes there are too many people in the school to take the exam, and the school can apply for an extra exam. As for whether to add or not, it depends on whether your school has organized an application. It is best to take the exam with the school. My friend took the exam at school for 25 yuan, although it was 1 year ago.
C If the school is not organized or has graduated, so there is no need to receive training, it is recommended to go directly to the local language committee, 50 yuan+photo+copy of ID card, etc. Outside organizations generally require training or charge more service fees.
In addition, this exam is relatively simple, as long as you pass it, you will have a certificate, but the level is different. There are textbooks in the bookstore, but it is of little significance, and the exam is not from textbooks. Just pay attention to practice more.