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So if you come first internally you are not guaranteed highest overall mark?
If you come first internally, you will have maximised your chances of achieving a favourable Assessment Mark, which contributes 50% towards your overall mark (the technical name for which is HSC mark). Until this point, you have only worked towards 50% of your overall mark.
What is left is to sit the HSC exam, which contributes the other 50% towards your overall mark in a particular subject. Performance in the HSC exam is independent/unaffected by your rank relative to your cohort and your school rank. It depends solely on your own performance and is also subject to alignment.
Once you have completed both components, the relevant processes will be applied (including moderation and alignment). Your results will eventually be formatted as follows:
As you can see the HSC mark is the student's final mark for a particular subject. This mark is the average of the student's Assessment Mark and Examination Mark. In this example, the student's Assessment Mark for Mathematics Extension 2 is 84, and their Examination Mark is 80. Therefore, their HSC Mark is