they only copied some of the questions, not the whole paper.
but if you want to delete on the basis of copying, you'd have to delete everything i think.
for example the 2010 hsc maths ext 2 Q8 - copying from a resource from the mathematical association of america, hence subject to us copyright law which stipulates although copying ideas is not a breach of copyright, copying the expression of those ideas is a breach.
so there is nothing there saying "reproduced with permission from the mathematical association of america", yet the expression of the ideas in that question did in fact come from this
and so may be deemed a breach of us copyright law.
so are we going to tell nesa to delete that exam from their website?
it opens a big can of worms - resulting in deleting everything ..... and is that what we really want?