Law of diminishing marginal returns can help you answer this haha
You can spend your time knowing 100% of the syllabus, with the last 10% or so being the hardest and taking the longest. So much so that learning that final 10% takes the same time as learning the other 90%.
Or you can spend your time cultivating 100% of the exam technique, with the last 10% or so being the hardest and taking the longest. So much so that learning that final 10% takes the same time as learning the other 90%.
Hmm....
Just learn the bottom 90% (or so) for both, splitting your time evenly (or whichever way represents the most balanced cover).
Learn a basic content level for each chapter, memorizing maybe 5 or 6 key stats for each chapter (maybe more for some chapters like trade and financial flows). Then you have a good basis upon which you can do the exam practice.
Otherwise, you can spend the remaining time not doing past papers and learning the intricacies of the content like memorising hundreds of stats, most of which are hardly relevant, or learning the exact process by which Fair Work Australia facilitates dispute resolution cases or taking half a page of notes on the Intergenerational reports.
See the logic?