A fella I know did not have year 12, only year 10 passes.
He applied for an Australian Airline about 8 years ago (sorry, can't name which one, I am sure you understand).
On the part about year 12 pass marks, he typed/wrote "available on request".
They never asked and he never provided "on request".
He has been a Captain for a couple of years now, I suggest you do the same!