Yeah for Australia I'd just look at how the different political parties perceive/look to achieve the particular national interest, so for example for environmental security you'd talk about the Liberals and their 'direct action policy'/valuing of economic growth over environmental security and contrast that with the greens who see environmental security as their number 1 priority. I generally favour the Liberals vs Greens comparison because their policies contrast so much. So then for:
immigration/refugee policy: liberals value border security above all, greens want human rights/fulfill international obligations
relationship with the US: liberals love them some 'murica, while the greens are a bit more reticent regarding supporting the US in overseas engagements and anti-terrorism activites
trade not aid: liberals are more for increased trade and etc whereas greens want to keep aid and reach that 0.7 level of GDP that we agreed to
Reus: I suggest just reading through the preambles, highlighting the key words and seeing how they can be applied to the key knowledge points, that's where they're getting their questions from. Other left of field questions that could appear are:
evaluate the impact of TNCs on the global political arena
a questions about TNCs and NGOs in relation to causes and solutions to ethical issues
can mechanisms of global governance respond to and stop global crises (essay question maybe?)
does the notion of sovereignty present an insurmountable challenge to resolving crises
there could be others, so that's why I suggest looking through the preambles yourself