FIT / PEI PART
The goal when answering these questions is to show the interviewers your critical thinking and problem-solving skills and how suitable you are for the job.
Behavioral questions might be like:
Why consulting? / Why company XX? / Why are you the perfect fit for this position? / Lead me through your CV
Describe a time when you disagreed with a team member
Tell me about your biggest mistake at the workplace
Name three improvements you made in your most recent position
You can find other questions online; just pick some of them and start answering them in a way that makes sense:
Keep it short (1.5 minutes max)
Use storytelling techniques (Structure your speech!)
Try to get the interviewer to participate, e.g., while telling about your experience in place XX, ask them whether he has been there.
The more questions you practice, the easier it becomes for you to come up with a friendly and suitable answer.
Regarding the fit part, many candidates tend to underestimate its importance.
However, as a former part of the recruiting team, I must say that the Fit part is not only about the questions you’re asked, but it is something that can be judged throughout the entire interview. Candidates who think it’ll be enough to master 2-3 questions for passing the fit are wrong. It is more about your approach, what kind of a person you are, how you behave in stressful situations, whether you are friendly, what kind of first impression you make.
What’s essential for the case:
Independently of the firm, on the project they are specializing in, you should be able to recognize the problem and suggest solutions
Driving the case
structural / logical / strategic thinking (Test like Imbellus, GMAT, McKinsey PTS, etc. will help, too)
math (Practice math with a tool provided by PrepLounge: (https://www.preplounge.com/en/mental-math.php)
Here is an excellent preplounge article on case solving: https://www.preplounge.com/en/bootcamp.php/interview-first-aid/crack-the-case-interview/approaching-a-case
Start by studying this one but don't waste your time studying plain theory because case solving is all about PRACTICE.
Here are some cases you might want to check out:
For Beginner level: Laundry Chain - Revenue Increase https://www.preplounge.com/en/management-consulting-cases/interviewer-led-mckinsey-style/beginner/laundry-chain-revenue-increase-215
Launching Caskets in North Africa https://www.preplounge.com/en/admin/cases.php?action=preview&id=225
For Intermediate level: Grain Co-operative – Brand Launch https://www.preplounge.com/en/management-consulting-cases/interviewer-led-mckinsey-style/intermediate/grain-co-operative-brand-launch-217
Case with a twist: Chinese Alloy Wheels – US Market Entry https://www.preplounge.com/en/admin/cases.php?action=preview&id=226
For Advanced level/the real one and used for final rounds:
Non-Profit Museum Revenue Increase
I also recommend preparing with somebody who is more experienced than you - it'll save your time immensely! Could be a case-buddy or a coach (the latter in general more effective:))