I didn't say that anyone should be doing all of that on their Christmas break. I didn't do any holiday revision because its wholly unnecessary. That doesn't mean that anyone who chooses to do 1/4 wouldn't have an enormous edge on the kids they will be challenging for preferable ranks.
This is the only post that answers your question properly. The only thing I would add is the importance of consolidating your knowledge through ongoing revision. 90% of the information you absorb when you read a text book is lost the next morning--98% if you get less than 8 hours of sleep that...
1. Summarize all text books and group content so as to correspond with syllabus points
2. Summarize all relevant information from www.hsc.csu.edu.au/
3. Watch relevant documentaries several times over whilst taking notes--http://www.surfthechannel.com/cat/61482.html
4. For Histories: Read...