I did some chemistry study back in high school in year 10 but dropped out in the middle because my chem teacher sucked. So I had to start with fundamentals, and it was insanely easy. I scored 95 without effort or extra study (I did go to lectures, tutorials etc) and was offered to take chemistry 2 but unfortunately needed that extra credit from chemistry 1 after withdrawing from my other (physics) class.
Chemistry 1 wasn't too bad, a bit of new concepts / formula but most of the things I learnt in high school were repeated in that course. So if you did a VCE chemistry, I'm pretty sure you'll find it just fine. Doing chemistry 2 in the summer sucks a lot, so if you have the prerequisite, I'll say doing chem 1 will be a better option as it's not too hard compared to fundamentals.