The most efficient way to get interview-ready for MBB
Practice real cases on-demand with a GPT trained to simulate actual interviews — and improve faster through repetition and a proven methodology.
Start practicing now for free → ✓ No account needed ✓ Built by an ex-McKinsey coach with 1,000+ case sessionsBusiness Cases
Solve realistic consulting cases. Build structures, analyze data, and defend recommendations.
Market Sizing
Solve realistic sizing cases. Build assumptions, run the math, and sanity-check outputs.
Market Sizing Guide
The complete step-by-step playbook for market sizing interviews — frameworks, examples, and expert tips.
Why this works
On-demand practice
Practice whenever you have time.
- No partner needed
- No scheduling constraints
- Short sessions still build reps
More reps, faster learning
Volume matters when feedback is immediate.
- Run more cases than with mock interviews
- Build pattern recognition across case types
- Fix weak spots through repeated practice
Method before memorization
Learn how to think, not what to memorize.
- Focus on a few core frameworks
- Adapt them to different case types
- Build repeatable problem-solving habits
Not just another GPT
Why is this better than using my own AI tool?
Need for high-quality case content
You need to find the right cases for your level, decide what to practice, and hope the case quality is good.
We selected the cases for you
- Curated cases built for realistic interview practice
- Complete scenarios with clear logic and data
- Coverage across business cases and market sizing
Need for real interview simulation
Generic AI often explains too much, gives away the answer, or fails to challenge weak logic.
We trained the interviewer for you
- Step-by-step interviewer-style interaction
- Pushback on weak logic and assumptions
- Dynamics modeled on real case interviews
Need for market sizing practice
Most prep resources focus on business cases. Sizing material is scarce, scattered, and rarely structured - leaving candidates to figure it out alone.
We built a full sizing tool for you
- Dedicated GPT for market sizing questions
- Structured method with clear frameworks
- Practice, generate, or solve sizing cases on demand
Need for expert feedback
Without knowing what good looks like, feedback can stay broad, generic, or hard to apply.
We built the method for you
- Designed by an ex-McKinsey coach
- Based on 1000+ coaching sessions
- Focused on real interview expectations
Preparing for MBB interviews is broken
Most candidates waste time, money, and energy on ineffective prep.
Problem 1 - Practice is hard to organize
- Finding partners takes time
- Scheduling is inconsistent
- Case quality varies widely
Problem 2 - Methods are fragmented
- Candidates memorize too many frameworks
- They struggle to adapt them under pressure
- Practice becomes reactive instead of structured
Problem 3 - Feedback is expensive or weak
- Strong coaching costs $200+ per hour
- Peer feedback often misses the real issue
- Mistakes repeat because they are not diagnosed precisely
How InterviewLab works
A simple loop designed to accelerate real improvement
Build a solid foundation
Access concise theory that focuses on:
- core frameworks
- structured thinking
- how to approach different case types
Practice with GPT
Work through realistic cases with:
- structured prompts
- interviewer-style follow-ups
- logic challenges along the way
Get targeted feedback
Receive structured feedback on:
- structure
- assumptions
- communication
Return and improve
Apply what you learned:
- refine your approach
- strengthen fundamentals
- build consistency over time