I'd say Nature of Biology 2 is an excellent resource for you to gather the fundamental aspects of all topics and delve into the topics an appropriate amount. I personally believe that there is a lot of information that is completely unnecessary, however in saying that, Nature of Biology is an excellent textbook to formulate your notes using that as a basis.
Biozone is an excellent way for you to perhaps increase your knowledge of a few topics (e.g. Water has a very dipole nature - it is able to dissolve many polar solutes in polar solvents because it has oxygen atoms that are slightly negative areas and 2 hydrogen atoms that are slightly positively charged). Don't get stressed if there is something you don't quite understand from Biozone, because it has been adjusted so that the topics discussed suit the whole Australian curriculum of Yr 12 Biology - hence, it isn't called VCE Biozone.