It must be the first in the exam, just the four books you mentioned. I am a graduate student majoring in power system and its automation. The first professional course is usually circuit, but there are several exams for power system analysis (such as Huadian, retest and follow-up). The second interview is generally about power system analysis (self-taught), high voltage (high voltage), power electronics technology (power electronics and electric drive), and motors (motors and appliances). As for electrician theory and new technology, there are various exams.