Marian, no answer yet so I'll chime in: I had both Deloitte rounds in the same day, and did a written + presentation at ATK. Can I help?
BCG written case: a)are calculators allowed? b)do you write slides or make PPT? c)how much time for analysis?
I have to design a framework to guide the go-to-market strategy based on factors such as market relevance, share etc