preppartnr

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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Home — Return to the homepage.
Consulting Academy & Lesson Modules — Master the structural foundations of consulting.
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How It Works — Understand our partner-grade rubric evaluation.

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

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Free Google Gemini Prompt for Case Interview Practice

Google Gemini Live (Gemini 3.1 Flash Live) provides sub-second voice latency and natural speech. Here is the exact prompt to copy-paste into Gemini, and why dedicated MBB prep requires a structured evaluation engine. Ready for Authentic MBB Pressure?: Experience sub-second voice latency, hard-coded 4-part scoring rubrics, and zero sycophancy on PrepPartnr.

The System Prompt

Paste this into a new Gemini chat window before launching Gemini Live: 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 Setup Gemini Live Voice

1. Open the Gemini app. 2. Paste the prompt into a new chat. 3. Tap the Gemini Live microphone icon to launch real-time audio interaction. 4. Speak through your structure, interrupt when needed, and state your calculations out loud.

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 great general assistant, but its politeness alignment means it won't push back on non-MECE structures or catch bad math. PrepPartnr wraps top voice models in a strict MBB rubric state machine.

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