You need to memeorize worthless shyt like bus speed operating values for certain interfaces and pin counts and configurations.
So if you are dealing with ddr memory and they tell you it is clocked ar x amount of mhz/ghz,.u need to.remember effective speed is doubled.
Or if they say "x processor supports 20x lanes of pcie 3rd gen, what happens when you put 16x graphics cards? Will the system see them?" You have to know that one will show up as 16x and the other as 4x with 1/4th the bandwidth, but yes they will show up in POST.
The questions are basic, but they never give you all the information. Be as specific as you can be
Also you need to know what governing body sets these regulations. JDEC, IEEE, ISO, etc