Free resource63 cases
63 consulting case studies with model answers. Free to read.
Every case has the full prompt, the exhibits and a model answer. Interviewer-led and candidate-led, across 14 functions and 21 sectors. Read any case here, no login. Want one on paper? Open it and we'll email you the PDF.
- All 63 free to read
- No card, no login
- Easy to Hard
- PDF by email
- Type, difficulty and page count
- Prompt: the brief, as read out
- Exhibits: charts and tables to work
- Model answer: structure and recommendation
The catalogue · function × difficulty
All 63 cases
Titles, format, difficulty and sector for every case in the library. Open any of them, no login needed.
| Function | Easy | Medium | Hard | |
|---|---|---|---|---|
14 functions, 21 sectors
The rows above are the functions. Pick the industry you are interviewing for:
What you get
Four things in every case
A case without exhibits is a riddle, and a case without a model answer is a guess. Every one in the library has all four.
- 01
The full case prompt
The brief as an interviewer would read it out: the client, the situation and the question you are asked to answer.
- 02
Exhibits
The charts and tables the case turns on. Read them, do the math and defend the number you land on.
- 03
A model answer
How a strong candidate structures it, what the exhibits say, and the recommendation the case builds toward.
- 04
Labels up front
Type, difficulty, function, sector and page count, so you can pick a short drill or a full sitting before you open it.
Three steps to your first case
Filter
By type, difficulty, function, sector or stretch area at /library.
Work it on screen
Prompt and exhibits first, then open the model answer to check yourself.
Or take it on paper
Ask for the PDF on any case; we email you a printable copy to run with a partner.
From our inbox
I wasn't practicing casing, I was practicing remembering.
Went well, thanks! Also wanted to say your free case library carried my interview prep. My partner and I had done our club casebook twice through. I'd open a case and already know the answer was "cut the underperforming SKUs." Then a senior gave me a healthcare pricing case and I fell apart. I wasn't practicing casing, I was practicing remembering.
20 sessions from your library later, first rounds felt familiar even when they weren't.
Kinda feel guilty it's free tbh
Some were too hard at first, so we tagged them by industry and difficulty and built an easy-to-hard schedule.
Read the whole email
Test went well! But the real reason I'm replying: your case library saved our casing group.
Four of us, rotating through the school casebook. By December we'd used up the good ones (one of the remaining cases was about DVD rentals, I'm not kidding). One of us quit. We were falling apart right before winter break.
I found your library searching for healthcare cases at midnight. Some were too hard at first, so we tagged them by industry and difficulty and built an easy-to-hard schedule. Three of the four of us now have MBB interviews.
Our schedule doc is still titled "Save the casing group."
Fix: I started with operations and supply chain cases (home turf) and worked outward.
Read the whole email
Solve went well. Quick feedback on the case library, since I used it as my main prep:
- 1. Mech E, zero business classes. The first 3 cases I opened were all market entry. Buried every time. After #3 my partner paused the timer and asked if I wanted a break. Not a great feeling.
- 2. Fix: I started with operations and supply chain cases (home turf) and worked outward. Market entry made sense after that.
- 3. Result: two first-round interviews this fall.
- 4. Suggestion: a "start here" path for beginners. It would have saved me that first week.
Emails from paying users, shared with their permission. We don't track real-test results; yours will depend on your preparation.
When you are ready for the online test
Cases build the fundamentals. The firms screen with something else.
Before the first interview, McKinsey, BCG and Bain each send their own online test, with its own format and timer. That is what our paid practice covers.
A library case is read at your own pace. BCG's Casey is a chatbot that asks one question at a time, with exhibits you open as you go and no way back. The screen on the right is our free Casey-style demo: a full case you can run tonight.
Not sure which test you will get? Our guide to MBB online assessments explains what each firm sends.
Online-test practiceBCG Casey-styleMcKinsey Solve-styleBain-style tests
Questions
Honest answers about a free library
Yes. All 63 cases, with the prompt, exhibits and model answer, are free to read in your browser. There is no trial, no tier, no card and no login. If you want a case as a PDF, we email it to you.
No. Every case page is public, and the free drills for math, charts and market sizing play without one too. A free account (no card) keeps your drill history. The PDF is the one thing that needs your email address, because we send it to you.
In an interviewer-led case the interviewer steers: they ask, you answer, they move you on. In a candidate-led case you drive: you choose the structure, request the data and decide when to recommend. The library has both, and each case is labeled.
Filter at /library by type, difficulty (Easy, Medium, Hard), function (14 of them, from Profitability to M&A), sector and stretch area, so you can drill the one thing you keep getting wrong.
Only partly. Cases build the fundamentals: structuring, math, reading exhibits and landing a recommendation. BCG Casey, McKinsey Solve and Bain's Sova or TestGorilla test are different formats with their own timing and mechanics. That is what our paid practice is for.
Practice for the firms' online tests: BCG Casey-style cases, McKinsey Solve-style scenarios and Bain-style aptitude tests, one-time prices from $20. The All-Access Pass ($250) covers all of it and has a 7-day money-back guarantee. The library stays free either way.
DrillCase is an independent practice provider. It is not affiliated with, endorsed by or sponsored by McKinsey & Company, Boston Consulting Group or Bain & Company.
Read alongside the cases
- Case skills articlesStructuring, math and common case interview mistakes.
- MBB online assessmentsWhich test McKinsey, BCG and Bain send, and in what order to prepare.
- BCG Casey online case guideHow the chatbot case runs, question types and the video recommendation.
- McKinsey Solve guideRedrock, Sea Wolf and the Sustainable Futures Lab, timing and scoring.
No. 01
Open a case. See if it is any good.
All 63 cases, prompts, exhibits and model answers, free to read with no account. Judge the collection on the first case you read.
No login, no card. Every case page is public.