A realistic four-week case interview plan builds fundamentals in week one, gets case volume in weeks two and three, and polishes with full mock interviews in week four, alongside daily mental maths and steady fit preparation. If you only have two weeks, compress this by focusing on the highest-yield activities: live cases with feedback, daily maths and your top behavioural stories.
What should you know before starting?
- Your format: interviewer-led (McKinsey-style) or candidate-led (BCG/Bain-style), or both.
- Your screening test: McKinsey Solve, BCG's online case or other assessments. Formats change, so check your invitation.
- Your interview date: plan backwards from it.
- Your weekly hours: this plan assumes roughly 10–15 hours a week, and you can scale it up or down.
Note that McKinsey's careers site describes Solve as requiring no preparation ("just approach it with curiosity and creativity"). Many candidates still familiarise themselves with the format. Decide what's right for you.
What does the four-week plan look like?
Week 1: Fundamentals
Goals: learn the case process, core structures and maths techniques.
- Read or watch a high-quality introduction to case interviews.
- Study the main case types: profitability, market entry, pricing, M&A, growth and operations.
- Work through official firm practice cases (McKinsey publishes several on its careers site).
- Daily mental maths: 15 minutes (see our guide to case interview mental maths).
- Fit: draft your "why consulting", "why this firm" and CV walkthrough. List eight possible stories.
- Cases: 3–5, solo or with AI, focusing on opening structure.
Week 2: Volume and feedback
Goals: build fluency and identify recurring weaknesses.
- Cases: 6–8, mixing human partners and AI practice.
- After every case, write down one thing to keep and one thing to fix.
- Exhibits: 10 chart interpretation drills (see how to read case interview charts and exhibits).
- Daily maths continues.
- Fit: write bullet-point notes for your top six stories, and rehearse two out loud.
Week 3: Depth and variety
Goals: handle harder and unfamiliar cases.
- Cases: 6–8, including at least two unusual ones (public sector, non-profit, operations).
- Practise both candidate-led and interviewer-led formats.
- Practise synthesis: a 30-second recommendation at the end of every case.
- Online test preparation if relevant (timed online cases for BCG, Solve familiarisation for McKinsey).
- Fit: full PEI-style deep dives on four stories with probing follow-ups.
Week 4: Simulation and polish
Goals: perform under realistic conditions.
- Full mock interviews, case plus fit, ideally 4–6, including at least two with experienced interviewers (former consultants or peers who have received offers).
- Back-to-back mocks to build stamina for final rounds.
- Review your notes from all cases and fix your top three recurring issues.
- Light maths daily to stay sharp.
- Two days before: reduce volume, rest and review your stories and firm research.
How many cases is enough?
There is no magic number. Prep providers commonly cite ranges from about 20 to 50 or more cases. Quality matters more than quantity: a case with detailed feedback and reflection is worth far more than three run on autopilot. The four-week plan above gives roughly 20–30 cases, which is a reasonable target for many candidates.
What's the two-week emergency plan?
If your interview is in two weeks, prioritise ruthlessly.
Week 1: Fundamentals plus volume
- Days 1–2: learn the case process and main case types, and work through two official firm cases.
- Days 3–7: two cases a day (at least one live or AI-led), with maths drills every day.
- Fit: draft "why consulting / why firm" and pick your four strongest stories.
Week 2: Feedback and simulation
- Days 8–12: two cases a day, focusing on your weakest area (often structure or maths).
- Two or three full mock interviews with experienced interviewers.
- Fit: rehearse your four stories with deep follow-ups.
- Days 13–14: light review, rest and logistics.
What to skip in an emergency: obscure frameworks, extended industry reading and over-preparing rare case types. What not to skip: live practice with feedback, maths and your behavioural stories.
How can AI practice fit into the plan?
AI case practice is most useful for volume and immediacy: running openings, maths and full cases at any hour, with instant feedback. Human practice is most useful for realism and nuance: rapport, subtle pacing and the judgement of an experienced interviewer. A sensible split is to use a dedicated AI interviewer such as caize.ai for many of your week 1–3 reps, then shift to human mock interviews in week 4.
How do you avoid burnout?
- Cap intensive case practice at about two or three cases a day.
- Schedule one lighter day a week.
- Sleep well before interviews. Tired candidates make maths errors.
FAQ
Is four weeks enough to prepare?
For many candidates with strong analytical skills, yes. Others prefer six to eight weeks. Start as early as you can.
Can I prepare in one week?
It's very tight. Focus on firm practice cases, a few mocks, maths and your top stories.
Should I prepare for the online test separately?
Yes. Timed online cases and game-based tests reward familiarity with the format.
How much time should fit preparation take?
Roughly a quarter to a third of your total prep time, more for McKinsey given the PEI.
