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AS AQA geography case studies - need help!

so the exam is just a week away and although i have a good knowledge of the course the one part i don't know are the case studies, my teacher is always off weeks at a time which put us quite far behind and didnt get taught the case studies we need. i was just wondering if anyone could give a list of case studies i could research as these will be important for the 15 mark questions. I'm doing the topics:
rivers
coasts
population
health

the only case studies i have are the mississippi floods and bangladesh floods for rivers. i also have the essex coast and the netherlands for coasts. it would be great if someone could help me out!