Well so far I'm finding that Year 11 Chem is mostly just the 'assumed knowledge' you need to have for Year 12, if that's what you want to call it. Having a good grasp of stoichiometry is necessary, and also pay attention in organic chem. Oh and acids and bases. But I'm unsure of what your study design will be like next year, given that it's changing.
try to work on speed and accuracy with chem, the fundamental skills are built in 1/2 so always try and speed it up or work on applying it to much harder and denser topics. When chem 1/2 goes to 3/4, they will throw a lot more details and figures into each question making them much more dense. Work on those skills!
Couldn't agree more!!
Honestly, just enjoy year 11. Try something new, be social, make good memories with your friends, etc. etc.

Don't stress about getting way ahead for year 12 and all that.
Make sure you have your good study habits nailed though. Year 11 is a good time to develop them, when things don't matter as much as year 12 and you can refine them and change them without worrying how it will affect your year 12 work.
But yeah, enjoy!! It's not long until you'll be finished high school altogether, so savour it