I was meant to reply to this a few days ago, but a forum glitch prevented me from replying
I'll repost a Reddit response I once made to a person asking a similar question. The new 3/4 course is largely the same as the current one (and the one I graduated under), except there's more focus on organic stuff and experimental techniques (organic wet tests) which is slay. This means the organic knowledge you acquire from U1 will be more important than ever. The biochem component of U4 has been rebranded, instead of talking about food, you'll learn about med chem.
Atomic structure, periodic table trends and intramolecular bonding (revision of year 7-10)
Stoich + concentration calculations using the mole concept, including writing balanced equations (don't worry too much if you're not the best at the maths side of chem since only 20% of marks on the VCAA chem exams are allocated to calculations. The remaining 80% are on written explanations. You'll get used to the maths gradually as you do past papers so there's enough time for this to become 2nd nature)
Intermolecular forces (probably the most important thing in U 1/2 as they determine organic molecules' physical properties from the structure which will be very relevant in U4. Intermolecular forces form the principles behind chromatographic analytical techniques which you'll look at in U2 and U4. Also very important for U3 where you look at fuel properties.)
Organic chem (super important for U4, make sure you recognise functional groups and know how to name organic molecules according to IUPAC conventions)
Polymer drawing conventions
Bronsted Lowry theory of acid bases (no need to calculate pH in 3/4)
Redox (very important for U3 electrochem, you need to know how to write balanced equations for redox reactions using the KOHeS method and be familiar with the redox jargon eg oxidant = reduced species and reductant = oxidised species)
Chromatography
