However, you need not memorize the photcopier cycle or air conditioning cycle. You should know the car engine. You will not be responsible for a detailed understanding of the transistor, but basically how it and diodes work is useful. Further you should know Ohm's law and basic circuits, transformers, motors, generators. There are some choices on the test so you can pick and choose somewhat.
Diagrams often help.
You should know some things about magnetic material and how magnets effect particle motion. You should know something about electromagnetic waves.