The cases might be modelled on real companies, but tye requirements and answers will be created by the examiner.
There is no collection of real cases to study. I suggest:
1 Studying and attempting the specimen and past exams on the ACCA website.
2 Buying a revision kit from BPP or Kaplan for practise.
3 Taking an interest in real life business events by reading, from time to time, the business section of a good newspaper. Weekend editions often summarise big stories. Don’t learn these; they are just for general background.