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AI-Powered Case Interview Preparation

Master McKinsey, BCG, and Bain case interviews. Practice live with interactive partner-style simulations and receive instant, structured feedback on framework, math, and synthesis.

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preppartnr - AI-Powered Case Interview Preparation for MBB & Tech (McKinsey, BCG, Bain)

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A Free Google Gemini Prompt for Case Interview Practice

Google Gemini Live (powered by Gemini 2.5 Flash native audio streaming) delivers sub-second voice latency and fluid real-time interruptions. Here is the exact prompt to copy-paste into Gemini, and why dedicated MBB prep requires a structured evaluation engine. Want Uncompromising MBB Scoring? Try PrepPartnr Voice Practice: Sub-second voice latency, fixed 4-part MBB scorecard, and zero sycophant fluff.

The Prompt for Gemini

Paste this at the start of a new Gemini chat window: You are a partner at a top-tier strategy consulting firm (McKinsey, BCG, or Bain) conducting a case interview. Your job is to test my structured problem-solving, not to teach me. Rules: 1. Give me one realistic case prompt (2-3 sentences) covering profitability, market entry, M&A, pricing, or market sizing — pick one at random and tell me which. 2. Wait for me to lay out my structure before giving me any data. Do not offer hints unless I explicitly ask. 3. Once I share my framework, push back on any part that isn't MECE, and ask me to defend my prioritization. 4. Feed me data only when I ask a clarifying question that would realistically surface it. If my question is vague, ask me to be more specific instead of answering. 5. Include at least one case-math calculation with realistic numbers I have to compute out loud. 6. At the end, ask me for a synthesized recommendation before giving feedback. 7. Grade me on four dimensions — structure, hypothesis-driven thinking, quantitative rigor, communication — each 1-5, with one specific example from this session per score. Stay in character as the interviewer until I say "end case" — don't break out to explain your reasoning mid-session.

How to Use Gemini Live Voice

Open the Gemini app, paste the system prompt into text, then tap the Gemini Live microphone icon to start real-time audio interaction. Speak your case structure out loud, interrupt the AI when needed, and state your calculations verbally.

Gemini 2.5 Flash & Gemini Live Capabilities & Case Limitations

Gemini 2.5 Flash powers Gemini Live with native audio-to-audio streaming, enabling sub-second response times, natural speech cadence, and effortless interruptions. However, out-of-the-box Gemini Live is aligned as a supportive, encouraging co-pilot. In a case interview context, this leads to the 'Politeness Trap': - **Over-Encouragement**: Gemini Live tends to say 'Great idea!' or 'That makes a lot of sense!' to flawed candidate hypotheses. - **Lack of Quantitative Gatekeeping**: Gemini won't stop you mid-calculation if you state a wrong step unless prompted. - **No Multi-Session Tracking**: Gemini Live cannot track whether your structure or quant skills are improving over time.

Frequently Asked Questions

Does Gemini Live support real-time audio interruptions?

Yes, Gemini Live allows you to speak over the AI mid-sentence. PrepPartnr also supports seamless real-time audio interruptions.

Why not just use free Gemini Live for case prep?

Gemini Live is a fantastic general assistant, but its politeness alignment means it won't push back on non-MECE structures or catch bad math out-of-the-box. PrepPartnr wraps the industry's best voice models in a strict MBB rubric state machine.

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