maths will definitely be carried over... which i dont like... circle geo can be so annoying even though i usually get them.
for sciences(not sure about physics) the concepts get carried over. I am basing this on doing bio and chem.
For bio u need to know like osmosis, diffusion, meiosis stuff like that. The list goes on. Actually quite a few things get repeated. Like animal response to environment(prelim was generaly hsc is australian animals) plant response to estuarine environments(prelim some local ecosystems and how plans respond, hsc is like mangroves or your choice.)
For chem like formulas such as c=n/v, n =m/M stuff like that...