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Three skills every screening test checks.

Train one in the next ten minutes.

01 · Mental mathWarm-up · 1 of 1

18% of $450K81K

$12M → $16M, 3 yrs10%

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Timed, graded the moment you answer, with the worked method after every question. Free to play; your results stay on this device until you make an account.

Start a 10-question math sprint or pick one of 10 skills

500 math questions · percentages, growth, CAGR, break-even, margins

  1. 02Market sizing

    Build the driver tree, land the number

    Lay out the drivers, watch them multiply through, then see your estimate on the reference range next to the model build.

    1 market, one clock · 32 markets

    Size a market Choose one
  2. 03Chart reading

    Read the exhibit, answer fast

    A consulting-style chart with a few questions: pull the value, compute the growth, find the driver.

    1 exhibit, a few questions · 50 exhibits

    Read an exhibit Browse charts
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What stuck was one set before opening email.

Solve went fine, but honestly the thing I want to thank you for is Daily Drill.

I'm a banking analyst and I was prepping on weekends only. By Wednesday I'd lost it all. In month three I finally got a mock with a McKinsey consultant. She asked me to estimate a margin and I just froze while she waited. She was so kind about it, which made it worse.

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Emily R.Banking analystDaily Drill (free) · Email,

lowkey the reason is the leaderboard.

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haha no drama this time, went well!

lowkey the reason is the leaderboard. last year in my first club mock a senior asked 15% of 480 and i pulled out my PHONE. in front of everyone. club president made all of us do daily drill after that. i was dead last week 1 and lost my streak twice during midterms. day 60-something now and top 10 in the club

casey math felt easy. phone stays in my backpack now lol

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But I did get faster.

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Thank you for asking. It went well. I'm a nurse practitioner moving into healthcare consulting, and I work 12-hour shifts, so time is my real problem, not discipline.

I bought a 300-page casebook and read 20 pages in a month. Three months in, I still couldn't size a market without a calculator, which was discouraging. A consultant on LinkedIn told me to put the book down and do small daily reps, so I did Daily Drill on my breaks. I missed a lot of days after night shifts, and it took two weeks before I noticed I was faster. But I did get faster.

One wish: an offline mode. Parts of our hospital have no signal at all.

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