We found 3 Reddit comments about The McKinsey Way. Here are the top ones, ranked by their Reddit score.
Look up these two books:
The McKinsey Way is considered a classic for typical management consulting. Engineering consulting is a little different business-less opinion, more numbers. I'd focus on being able to describe your skill sets as they relate to the job, and relevant experience or projects to what the company does - basically the same thing you'd do for a normal job interview. Relevant experience is the important thing, and if you don't have any, then talk about your ability to learn the process that they use in consulting jobs. Each job is different in the details, but the process will likely be similar from client to client.
Learn to talk, and how to see their perspective (this is a must read for everyone who is in any way a professional):
Recently I started also reading some books from McKinsey. Super great stuff. What I love about them is they really emphasise how to structure your thoughts, separate yourself from ideas, and to do what's best for the project.
Finally, some of your trouble might be that they're questioning your "strategy". They might be right!
EDIT: one more actually, and this is NOT a must read, but for some of us... it can be. Some of us need to learn how to get over ourselves: