More specifically, how can it be so good at SAT Math but not AP Calculus?

Or use a logarithmic scale

If it includes earbuds then earcups wearing out will be automatically disadvantaged. It's also possible to continue using headphones with worn out earcups, whilst it's not possible with a broken cable, so the latter category is more likely to be considered a fail.

Cable or port damage is a notorious source of failure amongst many products, e.g. charging port failure is one of the leading causes of getting rid of phones.