I'm not very experienced, although I love banking law, but any advice from people better than me would probably need to see the question!
I might advise like this: read the chapter, read the cases, check which facts of those cases match the facts in your problem question, then use those cases to give your legal opinion (i.e. say what the judges' opinion was) and that should decide the outcome for your hypothetical scenario.
By the way where are you studying banking law? Is it an optional module or compulsory? part of LLB or LLM?