MartRobThey are trying to get to know you. Focus on helping them understand what makes you tick, why you made certain choices more than being short.
On being concise. The thing is, many candidates just keep going on and on forever until someone interrupts them. Don't be that candidate.
Edit yourself, have a beginning middle and end but stay focused on the highlights, the most salient points. It needs to be interesting and ADDITIVE - like your answers in class.
For a recent project, I would argue CAR or STAR format so they can appreciate it; I am hesitant to say short answer for why consulting because that might be a really interesting story that helps them understand you better.
Just be WILLING TO BE BRIEF and not feel like you have to fill the space with a bunch of fluff. If the answer needs development, serve it, but don't manufacturer length for the sake of it. Shutting your mouth voluntarily shows confidence. Hope this helps.