McKinsey PST and Solve Preparation: Complete Strategy Guide

McKinsey’s digital assessment eliminates roughly 70% of candidates before they ever reach a case interview. Whether you face the traditional Problem Solving Test (PST) or the gamified Solve assessment, your preparation strategy determines whether you advance to the interview rounds.

PST vs. Solve: Understanding the Assessment Landscape

McKinsey has been transitioning from the paper-based PST to the digital Solve game since 2020. Based on our analysis of candidate experiences, here’s the current state:

The PST passing threshold hovers around 70%, with approximately 30-35% of candidates advancing. Solve uses algorithmic scoring that tracks your mouse movements and decision-making process—guessing correct answers won’t help if your approach lacks logical structure.

The Solve Game: Mini-Game Types and Strategies

Solve currently features four potential mini-games, with candidates typically facing two per assessment:

flowchart TD
    A[McKinsey Solve Assessment] --> B{Mini-Game Assignment}
    B --> C[Ecosystem Building]
    B --> D[Redrock Study]
    B --> E[Sea Wolf]
    B --> F[Plant Defense]
    
    C --> G[Constrained Optimization]
    D --> H[Data Interpretation]
    E --> I[Systems Thinking]
    F --> G
    
    G --> J[Process Score]
    H --> J
    I --> J

Ecosystem Building

You select species to create a sustainable food chain within environmental constraints. The algorithm evaluates whether you systematically test hypotheses or randomly place species.

Winning approach: Start from either end of the food chain (producers or apex predators), not the middle. Work linearly through the system, documenting each trial on paper.

Redrock Study

A data interpretation challenge requiring you to answer questions about ecological research. Tests your ability to extract insights from charts, tables, and text—skills directly applicable to profitability cases and financial analysis.

Winning approach: Read all instructions before the timer starts. Take structured notes because the source material disappears during the question phase.

Sea Wolf and Plant Defense

These test systems thinking and constrained optimization respectively. Both require you to adapt strategies based on changing conditions—similar to how consultants adjust recommendations as new data emerges.

The Five Skills McKinsey Tests

Understanding what’s measured helps you practice deliberately:

PST Question Types: Prioritization Framework

If your target office still uses the PST, focus your preparation on the highest-value question types:

Reading Facts questions dominate the test. Master chart interpretation and mental math first—these skills transfer directly to case interviews.

Preparation Timeline

Based on our experience coaching candidates, allocate 7-15 days for focused preparation:

timeline
    title McKinsey Assessment Preparation Timeline
    Day 1-2 : Understand format
            : Review official resources
            : Take diagnostic test
    Day 3-5 : Core skill building
            : Mental math drills
            : Data interpretation practice
    Day 6-10 : Mini-game practice
             : 10-20 sessions per game type
             : Document strategies
    Day 11-14 : Full simulations
              : Timed practice tests
              : Review and refine approach
    Day 15 : Light review
           : Rest before assessment

Mental Math: The Foundation Skill

Both PST and Solve require quick calculations without a calculator. In our experience, candidates who invest in mental math see the highest score improvements. Practice these daily:

• Percentage calculations (15% of 840 = ?)
• Division with remainders (2,350 / 7 ≈ ?)
• Compound growth estimates (100 growing at 8% for 5 years ≈ ?)

Start with our mental math guide for structured drills.

Strategic Tips for Assessment Day

For Solve:

• Use pen and paper liberally—document every hypothesis tested
• Don’t restart from scratch after one failed attempt; backtrack to the last working state
• Finish the game even if time is running short; incomplete submissions hurt more than imperfect ones

For PST:

• Skip difficult questions and return later; every question has equal weight
• On fact-based conclusions, verify that your answer is proven by the data, not just plausible
• Watch for unit mismatches (monthly vs. annual figures)

After the Assessment

McKinsey typically notifies candidates within 1-2 weeks. If you advance, immediately shift focus to case interview preparation. Practice with McKinsey-style cases to familiarize yourself with interviewer-led formats and hypothesis-driven structures.

If you don’t pass, you can usually reapply after 12-24 months depending on the office. Use that time to strengthen analytical skills through practice cases and structured problem-solving exercises.

Key Takeaways

• McKinsey Solve tracks your process, not just answers—systematic approaches outperform lucky guesses
• The PST passing rate is roughly 30-35%; Solve has similar selectivity
• Allocate 7-15 days of focused preparation with 10-20 practice sessions per mini-game type
• Mental math proficiency is foundational for both assessment formats
• Start from one end of any system (top or bottom), never the middle
• Document your hypothesis-testing process on paper during the assessment

Ready to Prepare?

Build your analytical foundation with McKinsey cases from our case library. When you’re ready for realistic interview simulation, try our AI Mock Interview to practice structuring problems and delivering recommendations under pressure.