BCG Interactive Case Library and online case assessment prep

When candidates search for the BCG interactive case library, they are looking for BCG's official self-paced practice cases. Old links to BCG's retired standalone Interactive Case Library now redirect to the general Case Interview Preparation page, where that legacy tool has been replaced by the OneDay@BCG virtual job simulation program and the official post-application online assessment.

1. Modules

   Pick from 13 modules and compare answers

   Once you register on the OneDay@BCG portal, you can choose from 13 modules across strategy, data, technology, and operations. After you complete a task, you receive real-world sample answers written by BCG leaders, consultants, and designers so you can compare your structure and reasoning against theirs. Completing simulations also earns digital badges that you can share on social networks and reference on your BCG application.

2. Virtual office

   Explore the 3D virtual office

   Alongside the case modules, OneDay@BCG includes an interactive 3D virtual office where you can watch videos, read blog posts, and listen to audio clips from BCG teams.

3. Cost and access

   Free and self-paced

   Free and self-paced on BCG's Virtual Experience portal, with 700,000+ participants enrolled.

4. Feedback format

   Sample answers from BCG

   Unlocks sample answers from BCG leaders, top-tier consultants, and designers after you submit your work.

5. Application value

   Completion badges

   Provides completion badges you can add to your professional profiles when applying.

You do not need to finish all 13 modules before your interview. Pick the two or three that match the track you are applying to. Generalist consulting applicants should start with Strategy Consulting, Introduction to Strategy Consulting, and Introduction to Data for Decision Makers.

OneDay@BCG is for self-study before you apply. Once you submit a formal application, BCG's Talent Acquisition team reviews your materials to assess your skills and suitability for the role. According to BCG's Candidate FAQs, candidates for some positions are then asked to complete an official online assessment (often referred to by candidates as BCG's online case assessment or the Casey chatbot), and in certain cases a team member may reach out for an initial conversation before interviews begin. Like BCG's problem-solving case interviews, the assessment evaluates how you structure your approach, interpret data, perform quick calculations, and synthesize recommendations.

1. Invitation

   Your portal status changes to Assessment

   When you are invited to take an online assessment, your status under the My Applications tab in the BCG candidate portal changes to Assessment, which indicates you are currently completing an assessment as part of the recruiting process. You will receive an email with your scheduled assessment link and instructions.

   BCG Casey online case: format and prep

2. Expiry

   Watch the link's expiration window

   Keep a close eye on the expiration window in that invitation email. BCG's Application FAQs note that if your HireQuotient assessment link expires before you complete it, you must contact your recruiter directly. Your recruiter will send a new email containing an updated assessment link, a scheduled date and time, and a reset expiration timeline. Confirm the exact time limit, allowed materials, and question format directly in your assessment invitation email, as BCG tailors its process by role and location.

3. Where to check your status

   My Applications in the candidate portal

   Log in to the BCG candidate portal and open My Applications to see if your status reads Assessment.

4. Email setup rule

   Use a personal email you will keep

   Always register your BCG profile with a personal email address you will keep long-term, never a school or university email that expires after graduation.

5. Expired link fix

   Contact your recruiter right away

   Contact your recruiter immediately if a HireQuotient link expires so they can issue a new link with a reset timer.

If you advance past the application review and any required online assessment, you enter BCG's live interview rounds. BCG describes its consulting interview process as a two-way conversation across four formal steps, evaluating both your analytical approach and how you work with others.

1. Step 1

   Application

   Submit your resume and profile through the BCG Students or BCG Experienced portal. Students and recent graduates can hold up to four open applications at once, while experienced hires are encouraged to apply for one role at a time.

2. Step 2

   Skills Interview

   A traditional interview that explores your past experience, skills, and motivation for joining BCG beyond what is printed on your resume.

3. Step 3

   Case Interview

   Required for client-facing roles. You work through a realistic business challenge step by step to demonstrate your problem-solving and analytical skills.

   BCG case interview: process, examples and prep

4. Step 4

   Team Interview

   Also for client-facing roles, assessing your problem-solving, analytical, and communication skills in a collaborative setting.

5. Behavioral portion

   Do not forget the behavioral questions

   As Alumni Nandini Agrawal notes on BCG's Interview Process page, it is easy to focus entirely on case prep and forget that BCG interviews include a behavioral portion where you must tie your past experiences back to the requirements of the job. Senior Recruiting Specialist Renata Owczarek adds that interviewers review your responses against both BCG's values and its core competencies.

   BCG interview questions: fit and behavioral

In BCG's official Strategy Consulting simulation module on OneDay@BCG, you step into the shoes of a consultant helping a fictional tech company called BeyondTech, which has experienced declining profits and needs to improve its sales strategy. While you should register on BCG's portal to work through their official files, our team built the original worked example below around a similar B2B software profit and sales-channel problem so you can practice the exact math and structuring steps right now.

1. Case data

   The invented scenario

   Invented scenario written by our team: Suppose a B2B software company saw annual operating profit fall from $36 million to $27 million over the past year. Total annual revenue stayed flat at $180 million, split across two sales channels: Direct Enterprise Sales ($120 million revenue) and Partner Reseller Sales ($60 million revenue). You ask how channel mix and costs changed, and the interviewer shares the following case data: a year ago, Direct Enterprise Sales generated $150 million at an 80% gross margin after sales commissions, while Partner Reseller Sales generated $30 million at a 50% gross margin after reseller discounts. Fixed overhead stayed constant at $99 million in both years.

2. Step 1

   Check last year's profit baseline

   Direct Enterprise gross contribution was $150 million times 0.80, which equals $120 million. Partner Reseller gross contribution was $30 million times 0.50, which equals $15 million. Total gross contribution was $135 million. Subtract $99 million in fixed overhead to confirm the $36 million operating profit baseline.

3. Step 2

   Calculate this year's channel contribution

   Direct Enterprise gross contribution is now $120 million times 0.80, which equals $96 million (down $24 million). Partner Reseller gross contribution is now $60 million times 0.50, which equals $30 million (up $15 million). Total gross contribution is $126 million. Subtract $99 million in fixed overhead to get $27 million in operating profit.

4. Step 3

   State the business insight

   Revenue stayed flat at $180 million because $30 million in new Partner Reseller sales replaced $30 million in lost Direct Enterprise sales. However, because Partner Reseller sales carry a 30 percentage point lower margin (50% versus 80%), every $10 million that shifts from Direct to Partner costs the company $3 million in operating profit ($30 million shift times 0.30 margin gap equals the $9 million profit drop). To fix its sales strategy, the client must stop direct reps from handing existing enterprise renewals over to resellers and tie sales compensation to gross margin dollars rather than top-line bookings.

5. Clarify the objective first

   Confirm what the client wants

   Confirm whether the client wants to restore the $9 million in lost profit, grow top-line revenue, or both.

6. Segment before concluding

   Flat revenue hides a channel shift

   Flat total revenue of $180 million hides a $30 million channel shift between Direct and Partner sales.

7. Show your math out loud

   State the formula first

   State the formula (Revenue times Gross Margin minus Fixed Cost) before computing the numbers.

Small errors in the BCG candidate portal can stall your application before you ever see an online assessment or case interview. Keep these official rules in mind when you set up your profile.

1. Reapplication timeline

   Wait at least 12 months to reapply

   If your application is unsuccessful for a role, BCG recommends waiting at least 12 months before reapplying so you can demonstrate additional experience and growth.

2. Interviewer names

   You learn them on the day

   You will find out who your interviewers are on the day of your interview, as client commitments can cause schedule changes at short notice.

1. 1

   Your client is BeyondTech, a B2B software provider whose operating profit fell by 25% over the past year even though total annual revenue stayed flat. The CEO believes the sales team needs a new strategy. How would you structure your approach to find the cause of the profit drop and fix the sales strategy?

   Show the sample answer

   Sample answer. Example answer written by our team. The applicant is invented. Since BeyondTech's total revenue stayed flat while operating profit fell by 25%, the issue has to come from either a shift toward lower-margin revenue or an increase in costs. I would structure this into three areas. First, revenue mix and pricing. Flat total sales often hide a shift beneath the surface. I want to break revenue down by product line, customer segment, and sales channel to see if high-margin enterprise software shrank while lower-margin services or discounted reseller deals grew. Second, sales and delivery costs. I would split costs into cost of goods sold, variable sales commissions, and fixed overhead. Specifically, I want to check if customer acquisition costs jumped due to heavier discounting, higher sales rep commissions, or longer enterprise sales cycles. Third, sales force execution. To build a better sales strategy, I would look at how territories are assigned, whether sales incentives reward top-line bookings instead of profit margin, and where reps are losing deals. I would like to start by looking at last year's and this year's revenue and gross margin broken down by product or sales channel. Do we have that breakdown available?

   It directly follows BCG's official case interview guidance: it listens to the constraint in the prompt (flat revenue with a 25% profit drop), structures the problem into three clear branches without using generic jargon, shows the mathematical logic behind a mix shift, and asks one targeted question to drive the case forward.

Working through self-paced online modules teaches you what good consulting output looks like, but live case interviews happen out loud. BCG warns candidates not to stay silent, rush responses, or overcomplicate solutions. Use this step-by-step plan written by our team to bridge from BCG's virtual simulations to live spoken cases.

1. Days 1 to 2

   Run two core OneDay@BCG modules

   Complete Introduction to Strategy Consulting and Strategy Consulting (BeyondTech). Before opening BCG's sample answer on each task, set a two-minute timer and speak your own structure and recommendation out loud.

   From OneDay@BCG Virtual Experience Program.

2. Days 3 to 4

   Drill data storytelling

   Complete Introduction to Data for Decision Makers. For every chart or table you see, practice stating the main takeaway in one sentence, backed by one calculated number and one comparison.

3. Day 5

   Prepare your Skills Interview stories

   Map four personal stories to the five qualities BCG interviewers look for (Integrity, Intellectual Curiosity, Creative Thinking, Collaborative Mindset, and Drive). Practice stating your personal role and the measurable result in under two minutes.

4. Days 6 to 7

   Run full 30-minute spoken mocks

   Move off written screens and complete full-length spoken case interviews where an interviewer probes your assumptions and checks your mental math. Prepare two thoughtful questions for the end of the interview, which BCG London Consultant David Ogbechie highlights as a key way to confirm mutual fit.

   From BCG Consulting Interview Process.