The concepts learnt in first year chemistry, particularly in first semester, is just a continuation of the HSC course. You'll learn about orbitals, VSEPR theory, electrolysis, the atmosphere, equilibrium constants, etc. I don't think advanced chemistry and normal chemistry differ significantly from one another.
Second semester, on the other hand, consists of a lot of organic chemistry, which is pretty new. Be prepared for it, because there is a lot to learn (all the mechanisms of organic reactions, etc). You'll also learn about acids and bases in second smeester (pH, etc).
The labs aren't too bad. You'll do titrations, flame tests, extractions, etc.
First semester physics involves learning about mechanics, waves, thermodynamics, and if you do the advanced course, chaos. The course has a lot of maths, so be prepared. The labs are shocking. I don't how I managed through them. They are difficult to understand, but if you just read the experiment and do as it says, you should be able to do it.