I am a junior now, studying mathematics and applied mathematics, and I want to take an examination of electrical engineering and its automation. How should I prepare? Try to be as detailed as possible, and thank you. I suggest you get into North China Electric Power University. Most other schools test circuits. Dude, the circuit is not so easy to learn, because the circuit is theoretical, and you can play as the teacher wants. This problem can only be solved during the day. Huadian Power System Analysis is an engineering course with weak theory. What is the power system in China? That's what the title says. Easy to learn and easy to attack. You can recite, you can remember, and you can get high marks. For example, the AC power grid will always be 50 Hz, and there will be no strange things like 38 Hz, 77 Hz and 456 Hz (I just said a few numbers). The voltage can only be 220v, 380v,10kV, 35kV,110kV, 220kV, 500kV, and there will be no other numbers. Circuit, not necessarily, grotesque circuit diagram (not used at all in reality), disgusting data, even if you think about it, your stomach is blocked.