Revise revise revise! Honestly, buy the textbook and learn it. Knowing specific facts and figures will really boost your marks. Case studies are a must - even if the question doesn't say 'using examples' or whatever, case studies always get marks. So never write anything down without an example.
For the fieldwork exam, do your fieldwork! You'll be taken on a trip I imagine, and it's so important that you actually get some data you can write about. When you're back, make sure that for each location you visited, you have examples of primary research (questionnaires, stuff you did in the field), secondary research (newspaper articles, census data), evaluative points about your research and ideas of how you present your findings. As long as you've got these covered, you'll be prepped for any question they can throw at you.
Any other specific questions, feel free to ask!