well my view is kinda wierd "yes and no" yes it is not important to know the number of screws holding the LCD but it is important to know how to fix the LCD.©opy®ight is right
that test was created by experienced dell maker or whatever, if they think you need to know all that stuff, then you probably do....
and some times it so happens you might not remember how mant screws are there in LCD but you exacctly know what the problemn is and how to fix it.
well its all up to u dear