Actually he did come first internally for English advanced he had a course average of around 98 as well so he does have a good shot for a state rank in advanced English!
I do not agree with your solutions for question 12 c and 15cii.
for question 12c:
the question states that kim's annual salary in the FIRST year is $30 000 and increases by 5% each SUBSEQUENT year and similarly for alex his annual salary in the FIRST year is $33000 and increase by $1500 each...
but if i have these two pieces of information: school rank, subject ranks how do i actually get an atar estimate.
i.e. School: Fort Street High School
2011 Rank: 8th
Subjects (so far-cos i'm accelerated):
Mathematics Extension 1: rank 10/130
Mathematics 2 unit: rank 10/120
Chemistry: rank 15/125