In the Cambridge year 11 and year 12 advanced and extension 1 texts there are several instances of a square units and cubic units error
They don’t seem to exist in the standard or extension 2 Cambridge texts
In the year 12 extension 1 there are also instances where it is in fact done correctly
So for example in the answer section in the year 12 extension 1 we see the error in the answer to 12DQ6:

Whereas it is done correctly in the answer to 12BQ16e

In other words there should be no s.
The error has unfortunately also appeared in some nesa documents such as the marking guidelines for the 2022 advanced hsc as well as the sample paper for the new advanced syllabus
One may think that nesa and other hsc materials exist in a bubble, can get away with this mistake, as if the rest of the universe doesn’t exist and it doesn’t matter if they ignore internationally accepted conventions.
Does it matter if students leave school, make the error in front of their boss, and then the boss tells them not to make the mistake and asks is that what they taught you in school? From now on do it correctly please.
To save this embarrassment nesa and other hsc materials should correct this mistake and stop thinking they exist in a bubble and can therefore get away with this error as if it won’t matter.
They don’t seem to exist in the standard or extension 2 Cambridge texts
In the year 12 extension 1 there are also instances where it is in fact done correctly
So for example in the answer section in the year 12 extension 1 we see the error in the answer to 12DQ6:
Whereas it is done correctly in the answer to 12BQ16e
In other words there should be no s.
The error has unfortunately also appeared in some nesa documents such as the marking guidelines for the 2022 advanced hsc as well as the sample paper for the new advanced syllabus
One may think that nesa and other hsc materials exist in a bubble, can get away with this mistake, as if the rest of the universe doesn’t exist and it doesn’t matter if they ignore internationally accepted conventions.
Does it matter if students leave school, make the error in front of their boss, and then the boss tells them not to make the mistake and asks is that what they taught you in school? From now on do it correctly please.
To save this embarrassment nesa and other hsc materials should correct this mistake and stop thinking they exist in a bubble and can therefore get away with this error as if it won’t matter.