Hi there,
My suggestion would be to check in with the recruiter first and ask whether the case will be from within your target industry.
Most consulting firms keep the interview process industry-agnostic because they are testing for skills, not knowledge (unless you're applying for a specialist / expert role).
If you do get the confirmation that your cases will only be from the public sector or infrastructure, then makes sense to double down on those.
It might also make sense to talk with a few people in the industry who work in this sort of role and pick their brains on some of the current trends and what you should expect from the interview.
Best,
Cristian