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Sit the McKinsey Solve before the one that counts.
Practise Red Rock, Sea Wolf and the 20-minute Lab on original CaseStar papers. Review your completed work, see where points were lost and choose what to practise next.
This is the screen you work on.
The free Red Rock sample, as it runs. The objective sits above the brief, the clock counts in the corner, and every figure you save lands in your Research Journal. Solve is taken on a computer.
The free Red Rock sample on a phone-width screen, as it runs: the clock and the phase tabs across the top, your objective pinned above the paper, then the brief and the first exhibit with its legend. Solve itself is taken on a computer.
The objective asks for a rate. The chart’s axis counts individuals.
See it on a computer (a different paper from the same sample)
Red Rock Study
Read a brief, save the figures your objective needs, then calculate, write a short report and work through quick cases. One clock for all of it.
You practise reading exhibits, choosing the right base and keeping to the clock.
Red Rock Study in detailObjective By what percent did Elk fall between 2020 and 2024? Round to one decimal place.
Population trends, selected speciesIndividuals, 2020–2024Sea Wolf
Profile microbes, build a pool and choose three to meet as many of the site’s ranges and trait rules as possible. Some sites cannot meet all five conditions. Three sites, 30 minutes.
You practise holding three numbers at once, trait rules and deciding under time.
Sea Wolf in detailSustainable Future Lab
Rank four early priorities, then make the programme’s decisions as the situation changes, reading each consequence before you move on. Candidates report a 30-minute version on the longest invitations; CaseStar’s Lab is the 20-minute format.
You practise ranking priorities and weighing each consequence before you commit.
Practise the 20-minute LabSoil scientist
Field botanist
One fix, on your own numbers.
Review one change from your completed work, using your own answers. Red Rock and Sea Wolf add a short check on new numbers.
- Review your completed work and the stronger alternatives.
- Where your minutes went against the plan
- Whether you’re improving, sitting to sitting
Elk were 52.61% of the herd in 2020 and 47.03% in 2024. How much did their share change, in percentage points?
Start free. Pay once when you’re sure.
- 01 · TodayFreeA short sample of each game, no sign-up.
- 02 · When you’re readyFreeOne full sitting each of Red Rock, Sea Wolf and the 20-minute Lab, with a free account. Your free review is available for 72 hours after the sitting. After that, the headline remains; a Solve Pass reopens the details.
- 03 · Yours to keep€69 onceThe Solve Pass: unlimited sittings of Red Rock, Sea Wolf, the 20-minute Lab and the full mock and every review. No expiry. One payment, no subscription. Practice bank · checked 28 October 2026: Red Rock 12 study structures in 8 settings; Sea Wolf uses generated sites; the full mock draws from 13 puzzle families; 20-minute Lab 12 papers across 6 stories.