Is the campus recruitment exam of Guangzhou Power Supply Bureau difficult? What materials do you use for review?

The Guangzhou Power Supply Bureau’s campus recruitment examination tests professional knowledge and practical knowledge. Professional knowledge includes circuits, electrical distribution, relay protection, high voltage, power plant electrical, electromechanical science, analog electronic technology, and digital electronic technology. Practical tests include verbal comprehension, mathematical thinking, judgment and reasoning, and data analysis. Of course, the exam is difficult. After all, it is a elimination system. If you don’t score high, it is difficult to be admitted. So it is hard to get high scores. The information I am using now is this.