He got McKinsey and Bain interviews and practiced 30 cases with friends – but didn't make it past round 1.
Overconfident Ollie is a target school student with every reason to be confident. He joined Black Belt, made a plan – then mostly went at it alone.
His KPI was cases completed and when MBB's first round came, his floor wasn't high enough.
Katie and Japheth break down what went wrong, what's at stake if the approach doesn't change, and the specific steps Ollie is taking to rebuild before the next round of deadlines.
- Why casing volume without feedback builds false confidence
- What peer casing can't tell you – and why a coach can
- The "floor vs. ceiling" principle that defines where most candidates fall short
The May Black Belt cohort closes Tuesday, May 12 (limited spots). Learn more and join.
Resources:
- Join the May Black Belt cohort (see coaches)
- Book a free 15-minute call with Katie to map out your best path
- Create a free MC account to get Case Foundations, a case prep crash course
Transcript: Overconfident Ollie: Why 30 Cases Wasn't Enough for McKinsey and Bain
Who is Overconfident Ollie — and why he seemed ready
When Ollie joined Black Belt, there was genuine excitement. He came in with real energy and a clear sense of direction. He's at a target school on the West Coast, an NCAA swimmer, already in leadership roles, and had done a consulting project with 180 Degrees Consulting. Very impressive on paper.
He had originally been pursuing investment banking — impressive enough to land a summer internship going into his sophomore year. He decided it wasn't for him and switched to consulting. His target: MBB only.
Ambitious. Top school, student athlete, banking experience, MBB-only target. Nothing wrong with that ambition — we see it a lot. What we also see with a lot of candidates is a big burst of energy upfront. "I'm here, I have the profile, I'm a hard worker, I'm going to crush this." Ollie was exactly that. The question is always what happens after that first wave of momentum.
The peer casing trap: why case volume without coaching leads to false confidence
After that initial energy, Ollie lost momentum in a specific way. He was very confident in his own abilities — and because of that, he didn't really leverage Black Belt.
He asked to do a weekly check-in by text or email, just to have a little extra accountability. That's fine — some candidates like that structure. But when those check-ins started, what kept coming back was: "I've been casing with this person who's really strong. One of my friends who's also recruiting for consulting. A senior who got into BCG. One who got into McKinsey."
So the natural follow-up: have you started the self-study modules? Done any drills? Met with a coach?
"Yeah, yeah — I will. I'm just really booked up on casing right now."
That's the trap — it feels productive. You're doing work. You're practicing cases. But that doesn't always lead to the right outcomes. His KPI was cases completed. Not gaps identified. Not quality of reps.
By the time he applied, he'd done about 30 cases. That's a real number — it's not nothing. But 30 cases with peers who are also recruiting, who haven't been coaching MBB candidates for years — that prep has a ceiling. His peers couldn't see what he didn't know. And neither could he.
What happens when you apply to MBB without closing your gaps
Ollie applied to McKinsey, Bain, and Oliver Wyman for the March 29th deadline. He had a great profile. He had referrals. He was invited to interview.
He made it through the first round screening. He was not invited back for round 2.
That's heartbreaking. You put in the hours, you get the interview, and then you don't come back. The hard truth is: if Ollie keeps prepping the same way, we'll see the same result. Why? Because he still doesn't know his gaps. Does his sophomore peer know how to coach someone to land an MBB offer? Probably not. They're impressive and intelligent — but they haven't been doing this for years.
That's the value of a coach. A coach watches you do 2 cases in a row and tells you: you were strong on the first one, but you lost power on the second. Your math started to slip. Here's the specific thing you need to work on. That's not something a peer can give you.
The floor vs. ceiling principle in MBB case interview prep
On interview day, you default to your floor — not your ceiling. The whole case prep game is building that floor higher.
Ollie's floor wasn't high enough. The goal is to be on the 80th floor of the Empire State Building — not the first. And you can't get there by casing with peers alone, even impressive ones.
How to course correct case prep before the next MBB deadline
The reality check is direct: if you keep practicing only with peers, you are not going to get the internship. You may have to re-recruit. That's the truth — it sometimes hurts, but there it is.
Fortunately, Ollie can course correct for the next round of deadlines. After a heart-to-heart, a real plan came together.
First: self-study. There's training for every component of the case and behaviorals. Every week, Ollie completes those modules. No skipping.
Second: meet with a coach at least once a week. Non-negotiable.
There's an unspoken fear a lot of candidates have: I'm not going to look good in front of a coach. That's why so many candidates avoid it, even the ones who are paradoxically overconfident. You think you can figure it out yourself, and then you'll show up to a coach and they'll say "you're perfect, don't change anything." That's not how it works — and deep down, everyone knows it.
The fix is simple: self-study weekly, coach weekly, and use your peers for practice — not validation. Peers are reps. They're not feedback. That's the distinction.
The hard thing isn't knowing what to do. It's doing what you know to do.
What the Black Belt program includes and how to join before the May 12 deadline
Black Belt is a system, a community, and a structured path from zero to ready. It starts with an onboarding call to build a personalized prep plan — not a checklist, a strategy. Based on your timeline, your target firms, and your gaps.
From there, you're matched with coaches. Usually 1 to 3, with one as your primary. You schedule sessions on your timeline. In between, you're doing self-study, drilling on the app, and practicing with other Black Belts in the community.
Every time you meet with your coach, you should have improved since the last session. That accountability loop is what actually drives progress. And if you need support on resumes, cover letters, networking, or online assessments — that's included too.
Practical next steps: you can read through the coaches at the link in the show notes — about 25 coaches from McKinsey, Bain, and BCG, with bios and availability listed. You can also book a free 15-minute strategy call with Katie directly.
The May 2026 cohort closes Tuesday, May 12th. If it's past May, the next cohort is open — jump in.
Final words: do not let overconfidence keep you from finding and fixing your gaps. Fear and overconfidence are two sides of the same coin. Both will keep you from the feedback that actually moves you forward.
You have time before the next deadlines. But only if you start now.