i think that you can be screwed for essays, but you shouldn't necessarily be screwed for at least multiple choice and short answers.
For multiple choice its pretty obvious as long as you know roughly the course, but short answers may require some revision.
I think there are three thingsd that need to be learnt to get good marks in short answer.
1 - definitions
Know the meaning of main concepts like gloablisation, and all of the economic issues (e.g. they asked "define ecologically sustainable developement" last year and heaps of people got nailed)
2 - formula
Know how to calculate everything from terms of trade to the participation rate. I thinkt here are around 10 equations that you need to know either to actually make a calculation (show working etc) or to do in the multiple choice.
3 - Impacts / effects
They always ask particularly int he band 6 questions about impacts and effects. For each thing in the course, deduce a list of impacts and effects that you can use. (impacts and effects can also include causes and other things like that)
But if you dont really know the course that well and you cant get a situation where you have a good general economics knowledge then you probably wont do as well in the essays, but then im sure you probably do if youve paid attention in class.
3 - impacts / effects
