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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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 Grok Prompt for Case Interview Practice

Turn xAI Grok 4 voice capabilities into an interactive case interview partner. Here is the copy-paste prompt, setup instructions, and why general AI needs an MBB rubric wrapper. 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 Grok before activating voice mode: You are a principal at a top-tier strategy consulting firm (McKinsey, BCG, or Bain) conducting a candidate 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 Grok 4 Voice

1. Open Grok on web or mobile. 2. Paste the prompt above as your opening text message. 3. Enable Grok real-time audio voice mode. 4. Speak through your hypothesis, construct your issue tree out loud, and synthesize recommendations.

Frequently Asked Questions

Does Grok Voice work on mobile?

Yes, Grok Voice is available in the Grok app. You can paste the system prompt into text, then toggle voice mode.

Why does PrepPartnr perform better than Grok for case interviews?

PrepPartnr pairs low-latency real-time voice with dedicated MBB state machines, ensuring strict math verification, MECE issue tree auditing, and persistent performance tracking.

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