It depends what case studies your school used. Personally for urbanisation we studied Lagos, the Olusosun rubbish dump, and the Makoko slums for the LIC, and East Village/Olympic Park in Stratford for the UK. I've chosen to do resource management instead of economic development as I personally think it's easier (mainly common sense/logic) and there's less case studies. If you did choose resource management, it also depends if you chose food, energy or water (I did food) - Jamalpur, Bangladesh (rice-fish farming) for local sustainable food production and Almeria, Spain for large scale agricultural development
I'm sure BBC bitesize has information for your case studies if your struggling to find facts. Good luck.
I think you should focus on the topics you have covered so far. The best way to revise is taking short notes using pen and paper while reading. try to draw some illustration of the content and memorize definitions.