Hello!
I have the book infront of me, and with what it looks like, the questions are really testing your knowledge. Everything does seem to follow the syllabus.
Some are pretty tricky, and if they are too hard for you, stick to the ones that have come from BOSTES for the starters. (ie question 19) If they are too difficult, then you should go back and revise that section.
Once they are done, I would suggest attempting the others, as if you can do the others, you are 100% set for that topic. The great thing about this book is the fact it does go over answers near the end. (Arent as good as the ATAR notes chem topic test though)
If the answers don't help, just post it in here, and we would be happy to explain!
Overall, attempt them, but the questions don't normally get harder than that, so it is a good resource to use!