Practicing cases with peers is the preparation phase that has the most impact on your consulting interview performance. You can read all the books, solve a hundred cases on paper and master the theory of framing — but until you practice live with another person, you don't really know how you perform. Real interaction — thinking under pressure, communicating conclusions in real time, reacting to interviewer cues — is something you only train by practicing with someone in front of you. I've seen candidates enter MBB having practiced mostly alone, and others who only practiced with peers. There's no single formula. But what I can tell you after 300+ interviews is that the quality of your practice matters far more than the quantity. If you want your peer practice sessions for case interviews with peers to really prepare you, you need to do it with intention.

What you see practicing with peers that's invisible practicing alone

Solo practice has value — especially at first, when you're internalizing frameworks and building calculation speed. But there are fundamental interview aspects that only become visible when there's another person across the table.

The entire case-solving part — interactions with the interviewer, timing for thinking and calculating, how you communicate the conclusions from each analysis — is impossible to evaluate alone. You might think your framing is good because it looks clean on paper, but when you present it out loud and someone asks a follow-up, you discover whether you really master it or not.

Also reactions to cues and case pivots. In a real interview, the interviewer will guide you — sometimes subtly, sometimes not. How you absorb those cues, adjust your analysis, and keep the conversation flowing while thinking is something you only train with live practice.

Can an evaluator detect in the interview whether you practiced with peers or just from books? Not directly. What we see is whether someone is prepared or not — but we can't tell how they prepared. I know people who got in practicing alone, and people who only practiced with others. Ultimately it's about the person's skill combined with their practice. But solo practice has a natural ceiling: there comes a point where without external feedback, you stop improving.

How many sessions you need and how to make them productive

The recommendation is at least 10-20 peer practice sessions before a real interview. But more than quantity, what matters is quality. An MBA once asked me: "How do I know if the feedback a peer gave me is good?" The answer is clear: always practice with different people and look for common messages. If several people, independently, tell you your framing is weak or you take too long to reach the conclusion, there's something to it. That's feedback you can trust.

What distinguishes a productive practice session from one that doesn't help is the quality of feedback you get, how you absorb it and react. A session where you do a case, your peer says "that was good" and you move to the next one doesn't give you anything. A session where after the case you dedicate 10-15 minutes to breaking down what worked, what didn't, and why — that makes you better.

For a session to really help, both people need to take it seriously. The interviewer should have read the case beforehand, give cues at the right moment, and take specific notes about what they observed. The candidate should treat it like a real interview — no pauses to check notes, no redoing parts that didn't go well. Practice both roles: being the interviewer teaches you to see cases from the other side and understand what an interviewer really evaluates, which improves your own performance as a candidate more than you'd imagine.

Why you should get out of your comfort circle

A very common mistake is practicing exclusively with close friends or classmates you know well. At first that's fine — trust helps get past the initial discomfort of practicing out loud. But once that phase passes, trust stops helping and starts hurting.

With close friends, the level of rigor drops. They won't interrupt you like a real interviewer would. They won't pressure you when you give a vague answer. And feedback tends to be kinder than necessary. All that gives you false confidence that falls apart the moment you sit in front of a real evaluator.

Expanding your practice circle beyond your friends is essential. Look for practice partners in WhatsApp communities, university/MBA groups, or online platforms where consulting candidates connect to practice. The more diverse your practice group, the more variety of styles, levels and perspectives you'll find — and that prepares you for the unpredictability of a real interview.

Practice with people you don't know. The discomfort of doing a case with a stranger is much closer to what you'll feel in the real interview than the comfort of doing it with your classmate.

Practice plan: how to distribute 8 weeks before interview

If you have 8 weeks of preparation, ideal distribution is to start alone the first two weeks: internalize frameworks, practice framing on paper, do timed market sizings, and get familiar with case structure. This gives you the theory base you need before you're exposed to others' feedback.

Starting week 3, begin practicing with peers. First sessions will be uncomfortable — that's normal. You'll discover that things that seemed clear in your head come out disorganized when you say them out loud. That's exactly the value of peer practice: detecting those gaps before they show up in the real interview.

As you advance — weeks 5-8 — alternate peer practice sessions with sessions with a coach or expert. A peer gives you practice and general feedback; a coach with MBB experience gives you calibrated feedback against the real interview standard. The combination of both is ideal.

And don't limit practice to cases. You should also practice FIT with peers. It never hurts to do a couple FIT questions before the case in your practice sessions — you get feedback on how your stories sound and if your communication is clear and direct. FIT and case preparation complement each other, and practicing both in the same session mirrors what you'll find in the real interview.

Also dedicate time to preparing your "why consulting" answer and your Q&A section questions — both benefit enormously from practicing them out loud with someone who gives you honest feedback.

For practice resources and access to the NextEp community, visit nextepmbb.com/resources.

Frequently asked questions about practicing cases with peers

How many peer practice sessions are enough before a real interview?

I recommend at least 10-20 sessions, but quality matters more than quantity. One session with detailed, constructive feedback is worth more than five sessions where you just say "that was good". Practice with different people and pay attention to the messages that repeat.

Should I always practice as a candidate or also as an interviewer?

Both roles. Being an interviewer teaches you to see the case from the other side — what an interviewer really evaluates, how long silences feel, what it feels like when a candidate doesn't answer the question. That improves your performance as a candidate more than you'd imagine.

How do I find good practice partners?

WhatsApp communities of consulting candidates, university or MBA groups, and online platforms where candidates connect. Look for people at your level or above, and who take practice seriously. If after 2-3 sessions the feedback is superficial, look for someone else.

Can I practice with someone not preparing for consulting?

It's better than nothing, but not ideal. Someone who doesn't know MBB interview format won't be able to give you calibrated feedback on your framing, issue tree, or communication. If you have no other option, at least give them an evaluation guide so they know what to look for.

Should I practice in English or Spanish if the interview is in English?

In English from the start if possible. There's a common problem when two Spanish speakers practice together in English: they tend not to correct each other's language mistakes. If you practice in English, agree with your peer that feedback includes language clarity and communication too.

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