there is no such thing as typical case interview questions for interns. The case questions will be identical to what you would face as an applicant for a permanent position. The difference will be in the expectations that might be a bit milder for some dimensions (e.g., maturity in demeanor and communication, business accumen, second level implications of recommendation). So preparation should not be different compared to a permanent full time position application.
That being said, Accenture cases are often divided into multiple questions, each of them very specific. Interestingly, this style has a certain resemblancer to McKinsey’s interviewer-led style.