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.

Explore the preppartnr Ecosystem:

Home — Return to the homepage.
Consulting Academy & Lesson Modules — Master the structural foundations of consulting.
Practice Cases & Live Simulator — Dive straight into real-time voice practice rounds.
How It Works — Understand our partner-grade rubric evaluation.

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

preppartnr

A Free Grok Prompt for Case Interview Practice

With xAI's Grok 3 delivering sub-second real-time audio synthesis and rapid reasoning, you can run interactive case interviews directly inside Grok. Here's the exact prompt to copy-paste, how Grok Voice works, and why generic AI needs an MBB rubric wrapper. Ready for Real MBB Pressure? Try PrepPartnr AI Voice Mock Interview: Top-tier real-time voice, strict MECE scoring, and zero sycophancy.

The Prompt for Grok

Paste this into Grok at the beginning of a session: 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 Use It With Grok Voice

Open the Grok app, paste the prompt as your first text message, then activate Grok's real-time voice mode. Speak your answers out loud as if sitting across from a consulting partner. Verbalizing your framework and doing mental math aloud is critical for building genuine interview muscle memory.

Latest Grok 3 Voice Features & Limitations for MBB Prep

Grok 3 introduces impressive real-time audio generation with low latency and raw logical speed. However, Grok's default alignment prioritizes engaging, conversational banter, witty dialogue, and real-time web exploration. In a consulting case interview, this default orientation works against you: 1. **Web Search Distractions**: Grok often pulls live web news or market facts during a case rather than holding static, controlled case data. 2. **Sycophancy & Tone**: Grok tends to praise creative or confident candidate frameworks rather than auditing for strict MECE completeness. 3. **Lack of MBB State Machine**: Grok does not enforce quantitative gates or maintain a persistent candidate scorecard across multiple interviews.

Frequently Asked Questions

Does Grok Voice work on mobile?

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

Why does PrepPartnr perform better than Grok for case interviews?

PrepPartnr uses top-tier low-latency voice models paired with dedicated MBB state machines, ensuring strict math verification, MECE issue tree auditing, and persistent performance tracking.

← Back to preppartnr — Start practicing with AI →