BCG Internship Interview Preparation in 7 Days - Taipei

Hi Jack,

congrats on getting the invite to the online interview! That's a good sign!

Since the interview is only 20 minutes, don’t expect a full case. It will likely be two parts: your background and motivation for BCG/consulting, and a short business question (market sizing, estimation, or brainteaser).

How I would use the 7 days to prepare:

Personal fit: Craft a clear 1–2 minute intro (“who you are, why consulting, why BCG”) and prepare a few short stories about teamwork, leadership, or problem-solving (use STAR Method).

Business questions: Practice structuring your thoughts out loud. For market sizing, break it into logical steps. You can practice this based on everyday examples like the size of the Taipei coffee market, annual revenue of Uber in Taiwan, or number of restaurants in your city. For brainteasers, focus less on the “right” answer and more on showing logical, calm reasoning. 

Also if you feel you need more time, it’s generally fine to ask HR to push the interview back a week or two. 

Reach out to me directly if you want to further discuss!

Best,
Lukas

Hi Jack,

Congratulations for passing the online case! This must be exciting!

If you have no experience, 7 days is indeed short, but not impossible. As Lukas suggested, if you can push the interview by few weeks, that would be great. In any case, you should start preparing every day with a clear plan (fit, market sizing, frameworks..) and practice as much as possible with different peers/coaches.

You're on the right track, just push harder these next few days!

Happy to have a free intro call to help you tailor your approach and preparation, let me know

Best,

Oussama

Hi Jack,

Given you only have 7 days, focus on the highest-impact preparation:

1. Personal Fit (about half the interview)

• Prepare 2–3 clear stories on leadership, teamwork, and problem-solving. Keep them structured (Situation–Task–Action–Result).
• Be ready to answer “Why consulting?” and “Why BCG?” concisely.

2. Business Questions (likely short cases/market sizing)

• Practice quick market sizing: e.g., “Estimate the size of the coffee market in Taipei.” Focus on logical structure, assumptions, and doing math cleanly.
• Review profitability questions (revenues vs. costs) and simple growth/market-entry logic.
• Don’t worry about memorizing frameworks – focus on clear, MECE structuring.

3. Math & Communication

• Drill basic mental math daily (percentages, multiplications, dividing large numbers).
• Practice talking through your thinking step by step, even when you’re unsure. Interviewers want to see structured thinking, not the perfect answer.

4. Practice under time pressure

• Use PrepLounge or YouTube to practice 2–3 mini cases per day. Even short runs will build confidence.
• If possible, do at least 2 mock interviews with a friend / coach – have them throw you market sizing or brainteasers.

Mindset

• Don’t worry about being perfect – BCG knows interns are early in their journey. They look for logical thinking, curiosity, and coachability, not polished consulting answers.

With one week, you can’t cover everything, but you can show structure, confidence, and a sharp learning attitude – which is often enough to stand out.

Happy to help you prep and succeed – feel free to reach out!

Best, 

Evelina