Case Interview Preparation: Frameworks, Practice Plan and Common Mistakes
Acrapath Team
Everything you need to prepare for consulting case interviews: how a case interview works, the main case types, how to structure answers without relying on memorised frameworks, a four-week practice plan and the mistakes that cost offers.
The case interview is the heart of consulting recruitment. It tests how you think through an unfamiliar business problem, under time pressure, while communicating clearly. Good case interview preparation is less about memorising frameworks and more about building structured habits.
How a case interview works
The interviewer presents a business problem, such as "A coffee chain's profits have fallen. What should it do?" You ask questions, structure the problem, request and analyse data, and give a recommendation. Cases are either interviewer-led (the interviewer guides you through questions) or candidate-led (you drive the direction).
Common case types
Profitability – why are profits falling and what should the company do?
Market entry – should a company enter a new market or launch a product?
Growth strategy – how can revenue be increased?
Pricing – how should a new product be priced?
Mergers and acquisitions – should one company acquire another?
Market sizing (guesstimates) – how many electric scooters are sold in a city each year?
How to structure without memorised frameworks
Interviewers can tell when a candidate forces a textbook framework onto a problem. Instead, build a custom structure:
Restate the objective in one sentence.
Break the problem into three or four mutually exclusive, collectively exhaustive (MECE) buckets.
Add specific questions under each bucket, tailored to the industry.
Explain which bucket you would investigate first and why.
Market sizing tips
Choose a clear approach (top-down from population or bottom-up from supply), state assumptions out loud, round numbers to keep maths simple and sanity-check your final answer against something you know.
A four-week practice plan
Week 1: learn case types, read sample cases, practise mental maths daily.
Week 2: do one live case a day with a partner; focus on structure.
Week 3: practise data interpretation with charts and tables; increase to two cases a day.
Week 4: full mock interviews with experienced partners, including fit questions.
Mistakes that cost offers
Don't neglect the fit interview
Most consulting interviews also include fit questions. Prepare stories about leadership, teamwork, failure and impact, each lasting about two minutes.
Once you are prepared, find business analyst and consulting roles on Acrapath. Set alerts for consulting jobs and use Acra to discover openings that match your background.
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Frequently asked questions
How long does it take to prepare for case interviews?
Most candidates need four to eight weeks of consistent practice, including at least 30 live cases with partners, mental maths drills and fit interview preparation.
What are the most common consulting case types?
Profitability, market entry, growth strategy, pricing, mergers and acquisitions, and market sizing or guesstimate cases are the most common.
Should I memorise case frameworks?
Learn common frameworks as inspiration, but build a custom, MECE structure for each case. Interviewers prefer tailored thinking over forced frameworks.
How do I solve a market sizing question?
Pick a top-down or bottom-up approach, state your assumptions clearly, keep the maths simple with rounded numbers and sanity-check your final estimate.
Where can I find consulting job openings?
Acrapath lists business analyst, associate consultant and strategy roles. Set job alerts to be notified when consulting firms post new openings.
