There is no such thing as an unrealistic goal- anything is possible if you put our mind to it. Commerce/Arts is NOT 98.00 it is 94.30 and the NRSL cut-off at Sydney is 89.60 and 91.00 at UNSW. Also, my GPA of 5.00 is equivilent to a selection rank of 90. With Special Consideration at UNSW I can get a maximum of up to 5 points extra allowing my
selection rank to be > 91 and hence getting offered a place.
There is no such thing as an unrealistic goal! Anything is possible if you put your mind to it!
Honestly, your attempts to slide yourself into the double degree, considering your UAI and current GPA, are a bit unrealistic.
I might not get in but by trying my very best what have I got to loose?