Make sure you're rote learning as little as possible. Rote learning generally just doesn't work in physics or chemistry. Trust me, I've tried rote learning electromagnetism equations in physics. It doesn't always work very well.
Make sure you understand every step of a solution process for a question and ensure that you can, yourself, come up with it. Questions like 'how many double bonds are there in this molecule' when told how much iodine was added are simple when you see the answer, but you have to both understand the solution and be able to reproduce it. This is important.
Don't cram things; it's not good for long-term retention. Revisiting the content every few weeks helps more than you think; from my experience with memorising song lyrics, I can NEVER remember them in one go, but if I try again the next day, I'll retain so much more content.
The above is, of course, applicable to VCE in general and not just chemistry.