There are seven subjects in the national power grid examination for electrical specialty, which are circuit, power system analysis, high voltage, relay protection, power plant, motor and power electronics. The most difficult thing should be power system analysis, because this part is rarely mentioned in schools, and some schools do not offer this course for undergraduates. So if you want to take the national grid exam, you have to spend more time on it. Now you can make preparations in advance and take the time to review.