Your probably right. Maybe a 79/80. My initial 81 is likely wrong.
@jane1820 I think you are confusing scaling with alignment. These are two different processes for different purposes.
You HSC marks (marks received) are from NESA and are a conversion of your raw marks to NASA'S standards. For example, a raw 80 in some subjects is considered as a band 6 mark or "extensive knowledge" of thd course. Alignment involves a piecewise function with 4 to 6 linear equations for cutoffs for each subject so that each year, students receive marks to the same standards rather than being advantaged or disadvantaged due to change in difficulties from year to year.
Scaling is done by UAC and we do not receive this mark. Scaling is a fair process to compare the marks across different subjects and set them at an equally conversion. Think of it as converting all you currencies (such as Japanese yen and Australian dollars) to one currency (such as the United States dollar). In other words, a raw 80 in Mathematics Standard 2 is not equal to a raw 80 in Mathematics Extension 2 due to the competitive difference in each subject. It is a complicated process involving many mathematical methods such as percentiles and what not.
Hope this helps