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Daily case interview practice: market sizing questions, consulting math drills and brainteasers. McKinsey, BCG, Bain prep. Free. Practise for consulting case interviews every day, right from your browser. One classic question a day — market sizing questions, brainteasers, and case logic — each with a model approach written the way an ex-MBB interviewer would walk you through it: decompose, state assumptions out loud, sense-check the number. WHAT'S INSIDE • Today's question: a daily market sizing question or consulting brainteaser (golf balls in a 747, piano tuners in Chicago, petrol stations in Germany) with a strong-answer sketch • Math drill: unlimited consulting math practice — percentages of big numbers, compound growth, breakeven volumes, market sizing arithmetic — with instant checking and a daily score • Framework cards: profitability trees, market entry, pricing, M&A, synthesis — with the one move on each that actually scores in a case interview • A streak counter, because case interview prep is a daily habit WHO IT'S FOR Anyone preparing for case interviews at McKinsey, BCG, Bain (MBB) or other consulting firms — consulting club members, MBA candidates, undergraduates recruiting for consulting internships, and experienced hires. BUILT BY EX-MBB INTERVIEWERS This extension is by MBB Ready (mbbready.app), where you can take the next step: a full 30-minute spoken case interview with an AI interviewer, marked against the 2026 MBB rubric — sub-dimension scores, verbatim quotes from your transcript, and the one thing to fix first. Your first case is free, and there is a free 3-minute taster with no signup. PRIVACY Everything runs locally in your browser. The extension collects no data, requires no account, and asks for no permissions beyond local storage for your streak.