Your RAW MARK gets scaled for your UAI, NOT your aligned mark (the marks you receive). There is no direct correlation between aligned marks and scaled marks. Aligned marks and scaled marks are derived from two DIFFERENT PROCESSES. Most of you are intrepreting table A3 incorrectly. See the flowchart:
http://www.boredofstudies.org/other/flowchart.pdf
It is incorrect to say that all subjects scale down except near the top, because many of you believe that the aligned HSC marks are scaled.
So for example in Mathematics Extension 1, according to table A3, an aligned HSC mark of 46/50 corresponded to a scaled HSC mark of 45.2/50. This DOES NOT mean that 46 was scaled down to 45.2!!! The corresponding raw mark X (which is not revealed) becomes
scaled to 45.2 through one path and
aligned to 46 through another path. The way you're meant to interpret the table is that the 75th percentile = 45.2/50 aligned and 75th percentile = 45.2/50 scaled, with no correlation between aligned and scaled marks.
Another example is English Extension 2. The SAME aligned mark 50/50 led to different scaled marks. Why? Because they have DIFFERENT RAW MARKS behind them! It would be wrong to say that 50/50 scales to 50/50 AND scales down 48.9/50, because they have different raw marks behind them. You're meant to interpret the table as top mark = 50/50
aligned and top mark = 50/50
scaled with 99th percentile = 50/50
aligned and 99th percentile = 48.9/50
scaled