It can only be said that the placement is accurate, and there is a certain probability that the placement will be accurate in the exam. The focus is still relatively clear. There are fixed test sites every year, but the questions are not the same.

But 100 questions involve knowledge points, and we encounter many questions every year according to the knowledge points. The key to betting depends on whether the questions given by the teacher will be closer to the examination method of this knowledge point and whether the small details are the same. This is a teacher's skill.