Hey,
You should basically know,
Banking systems,
Elasticity,
Allocation of resources,
Demand and supply (PROPERLY!!),
Individual as consumer,
Labour Demand/Supply,
Profit maximising,
Fixed cost ect..,
economics of scale,
Privatising/Nationalising
Fiscal/Monterary,
Taxation,
Inflation,
Economic Growth,
Exchange Rate,
Standard of living,
Im not giving you an exchust list By the way, this is stuff that might come up, i've not learnt all of this myself, this is just to show you that you can learn some of this stuff if you havnt already.
Only a few of these topics might come, i bonded the ones that i feel will come.