Nono.
If you come first in your school group, and first within your school group in the hsc exam (being the external marking of the MW), your exam mark will be your mark.
Internal = the mark belonging to the person who got the same rank as you got in your internal, but in the external
external = your external.
In this case, internal also = external. so your average of the two would eb the same. i think they only use the /marks/ from your school to look at /how/ to allocate the internal marks. Say, outliers in the internal will be treated 'fairly' markswise. as far as i understand, the actual internal marks mean /almost/ diddlysquat compared to the rank, and especially if you come first.
(someone prove me wrong. I'm pretty sure that's right, but i'm not 100%... laz? )
and on a more personal note, i havn't lost an internal mark yet, so i'm 1st in a group of 54 or so. well, equal first with this other guy. I could potentially see myself getting full marks. Its not /likely/ cause english teachers don't like science generally. But for some reason, english teachers seem to like me. So, i really don't know. I think i'll get 48-50; 50's possible, but not likely.
AAAANNNDD
if you get 49 as your final hsc mark (so average of moderated int, and ext marks) then you are in the top 6-7% of the state. So its not thaaaat many people who get the uber marks, but its not thaaaat small either.