Case prep

AI case interview practice with Case Ace

A real interview, not a quiz. Case Ace plays the interviewer: opens the case, poses each question, shares exhibits when you need them, pushes back when your structure drifts and scores you against the model answer. 10 live cases per purchase.

Get Case Ace — — See a sample report Format: live chat interview · Length: 5–10 questions per case · Cases: the full library, every type · Scoring: per-question marks + written report

★★★★★ — from — reviews

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Try a question with Ace

Ace asks one question at a time and answers what you say. Here is a short exchange from AquaFresh, the sample case in the library.

Exhibit 1: what each service would do for AquaFresh

Service	Capex ($)	Revenue, YoY	Profit margin
Tech assets (app, website)	200,000	+3%	0%
Free pick-up and drop-off	100,000	+10%	−2%
Clothing sanitisation	300,000	+3%	+2%
Shoe shine	500,000	+4%	+3%

1. Ace: AquaFresh runs a chain of laundries and is losing customers to new start-ups. The owners want revenue to grow at least 10% a year. Here are four services the start-ups offer, and what each would do for AquaFresh. Which should it prioritise?
2. You: Free pick-up and drop-off. It’s the only one that reaches 10%.
3. Ace: Right, it’s the only one that clears 10%.
4. Ace: But look at its margin: minus 2%. Are you comfortable recommending a service that loses money?
5. You: Yes, if pick-up customers spend more on other services. I’d test that, and charge for faster delivery.
6. Ace: Good. That’s the real test: does it pay back through the rest of the business.
7. Ace: The owners have thirty seconds. What do you tell them?
8. You: Launch free pick-up and drop-off. It’s the only service that reaches 10% growth. It loses 2% at first, so pilot it in a few outlets and check that pick-up customers spend more elsewhere.
9. Ace: That’s how to close: the answer first, then the reasons, then the risk and the next step.
10. Ace: That’s the end of the taster. In a real case, you speak to me live, or type, and answer however you like. I respond to what you actually say. You choose how I interview you: Helper steers you when you’re stuck, Fair runs it like a real interviewer, and Adversary pushes hard on every assumption. Case Ace gives you 10 full cases from the library, 45 lessons, 9 kinds of marked drill, and a report on five skills after every case. Looking forward to interviewing with you!

Overview

A full case, led the way a real interviewer would.

Pick any case from the library. Case Ace opens with the case prompt, then takes you question by question — structuring first, then the numbers, judgement calls and synthesis. When you ask for data, the relevant exhibit appears. When your structure wobbles, the interviewer nudges you back — exactly like the real thing.

At the end you get per-question marks on structure and commercial judgement, plus a written report from the same feedback engine that powers our other sims.

• ✓ Live interviewer Every reply reacts to what you actually said — not multiple choice.
• ✓ Exhibits on request Tables, charts and diagrams appear when the case reaches them.
• ✓ Course correction Drift off track and the interviewer steers you back, without giving the answer away.
• ✓ Whole case library Every case in the library — profitability, market entry, growth, M&A and more.
• ✓ Scored report Per-question marks, skill-group breakdown and a written diagnostic.

What's inside

Lessons, cases and drills.

45 interview lessons

A structured course — from how a case unfolds to structuring, mental maths and the recommendation, playable inside the app.

The full case library

All 46 cases are complete interviewer scripts with exhibits, model answers and scoring rubrics — profit, growth, M&A, pricing, market entry and more.

Free to browse

The whole case library is open to browse, and Case Ace has a free trial — one marked drill + the first question of a real case, with your marks — so you can see the product before you buy the bundle.

Skill drills

221 bite-sized practice drills across nine kinds, for drilling individual interview muscles between full cases.

Start free: How a case unfolds · Case interview frameworks · Case interview math — no account needed to begin.

The flow

What a run looks like.

01 Pick your case

Filter the library by case type, industry and difficulty — profitability to growth strategy, retail to pharma.

02 Structuring

The interviewer opens with the case prompt. You lay out your approach; they probe it before moving on.

03 Exhibits & numbers

Charts, tables and diagrams land in the chat at the right moments. Work the numbers out loud.

04 Course correction

Go down a dead end and the interviewer pulls you back — a nudge, never the answer.

05 Synthesis & report

Close the case with a recommendation, then get per-question marks and a written diagnostic report.

Screenshots

Inside Case Ace

The report you walk away with, then the three lanes that get you there.

/caseace Scored reportPer-question marks, the skill breakdown and a written diagnostic — what you walk away with. /caseace Case lane — live interviewThe interviewer poses each question; you answer in chat and exhibits land as the case reaches them. /caseace Learn lane — guided lessonsSix chapters walk the whole case arc with exhibits built step by step — lessons never use your runs. /caseace Drill lane — quick-fire drillsOne focused question, a mark per dimension and a strength note — one interview muscle at a time.

Pricing

Case Ace, on its own or with every test.

A purchase buys 10 interviews with the AI interviewer — or bundle it with every McKinsey, BCG and Bain tool and save against buying separately.

Best value with every tool

MBB test prep + Case Ace

— Every McKinsey, BCG & Bain tool + Case Ace — —

• Case Ace — 10 interviews , AI-led
• Every McKinsey solver & simulation
• BCG Quant, Casey & Video Interview
• Bain SOVA & Video Interview
• One payment, instant access

Get MBB test prep + Case Ace — — or start a free trial →

Case Ace on its own

— 10 cases , AI-interviewed and scored

• The AI interviewer, marks and report — nothing else to buy
• Pick your 10 from the full case library
• Runs never expire

Get Case Ace — —

A case is one full AI-interviewed run; your purchase includes 10, and you can re-run freely inside a case you've already opened. Try it free first: one marked drill + the first question of a real case. Prefer every firm's test too? The MBB bundle carries every McKinsey, BCG and Bain tool, and MBB test prep + Case Ace bundles it all with this. Prices include taxes; payment is handled securely by Stripe.

FAQ

Questions, answered.

How close is Case Ace to the real thing?

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The interviewer opens with the case prompt and takes you question by question — structuring first, then the numbers, judgement calls and synthesis — with exhibits on request and a nudge back when your structure wobbles. An independent recreation: same format and pressure, never the official content.

How do the runs work?

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A Case Ace purchase puts ten live cases on your account — pick any case from the library, unlocked the moment payment completes. Open the tool, confirm the entry prompt, and one case is consumed — re-run freely within that open session. You can also add Case Ace to every McKinsey, BCG and Bain tool with MBB test prep + Case Ace.

Do my attempts expire?

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No. Attempts stay on your account until you use them — buy now, practise when your assessment is scheduled. Only entering the tool consumes an attempt; within an open session you can re-run as often as you like.

Is there a refund guarantee?

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The outcome guarantee covers the McKinsey bundle only; Case Ace and the MBB test prep bundles are outside it: see the terms.

Try it free — one marked drill + the first question of a real case, no card

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