I Have An Exam In Marketing The Exam Will Be About Analysis Case Studies

I have an exam in marketing.The exam will be about analysis case studies. The professor will give us a case study and we have to analyze it ( identifying the problem ,finding alternatives,evaluating the alternatives, and writing recommendations) I don’t know how I should start studying and preparing. Does anyone can guide me to the correct way to study or give me an excellent source that explains how to analyze a case study step by step? 

Thank you, 

 

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