Prepare for Consulting Firm Interviews: BIg 3, Big 4 & More
solve complex problems, drive global change, and make a lasting impact. However, the path to securing a job at one of these firms is highly competitive. The hiring process involves multiple stages, from online applications and phone interviews to challenging assessment tests and rigorous in-person interviews.
At JobTestPrep, we offer comprehensive PrepPacks that will help you prepare for every stage of the hiring process at top consulting firms like McKinsey, BCG, Bain, and the Big 4 (Deloitte, KPMG, PwC, EY). Whether you’re preparing for case studies, personality tests, or problem-solving games, our exclusive Consulting Bundle will help you gain the confidence and skills you need to succeed.
The Big 3 - McKinsey & Company, Boston Consulting Group (BCG), and Bain & Company - represent the gold standard of management consulting. These firms are known for their strategic thinking, innovative solutions, and influential roles in shaping the business world. If you want to work at one of these prestigious firms, you’ll need to pass through their highly competitive hiring processes, which include case interviews, behavioral interviews, and specialized problem-solving tests.
At JobTestPrep, we offer tailored preparation for each of these firms:
As a Big 3 consultant, you'll face high expectations in terms of analytical thinking, leadership, and business acumen. Our simulations are designed to meet those standards.
Behavioral & PEI Interviews (McKinsey Fit Interview)
In addition to case interviews, consulting firms—especially McKinsey—place significant weight on behavioral interviews, also known as the Personal Experience Interview (PEI). These interviews evaluate your past experiences and how they reflect key consulting traits such as:
Leadership under pressure
Teamwork and collaboration
Handling conflict or failure
Driving personal impact
McKinsey, for example, dedicates half of its final interviews to PEI. Candidates are expected to use structured storytelling, often following the STAR method (Situation, Task, Action, Result). JobTestPrep’s prep packs include detailed PEI question banks and sample answers to help you articulate your story clearly and convincingly.
1. Online Application and Recruiter Screening
2. Online Tests
3. Case and Fit Interviews
4. Final Interviews
5. Offer and Negotiations
The Big 4 - Deloitte, KPMG, PwC, and EY—are not only global leaders in audit and accounting but also offer top-tier consulting services in areas like strategy, digital transformation, and financial advisory. While the Big 3 focus on strategic consulting, the Big 4 provide a broader spectrum of services to help clients improve their operations and tackle the toughest challenges.
At JobTestPrep, we provide specialized preparation packs for interviews and assessment tests at the Big 4 firms, including case study simulations, numerical reasoning practice, and situational judgment test preparation.
| Feature | MBB (McKinsey, BCG, Bain) | Big 4 (Deloitte, KPMG, PwC, EY) |
| Main Focus | Strategy Consulting | Broad Consulting (Tech, Ops, Finance) |
| Interview Process | Case + Fit (PEI) | Case + SJT + Behavioral |
| Assessment Format | Unique Tests (Solve, Pymetrics, SOVA) | Game-Based, SJTs, Job Simulations |
| Candidate Profile | Top-tier academic / MBA | Broader, includes undergrads |
| Hiring Volume | Lower (selective) | Higher (more roles & departments) |
While MBB and the Big 4 dominate the consulting world, there are many other prestigious firms with their own hiring practices:
Accenture – A leader in technology consulting and innovation. Uses Pymetrics and digital assessments.
LEK Consulting – Focuses on strategy and M&A, with case-heavy interviews.
Oliver Wyman – Known for quantitative case interviews and industry expertise.
Roland Berger – Especially strong in Europe and growing in the US.
ZS Associates – Popular among life science grads; includes behavioral, case, and data interpretation tests.
Our consulting bundle helps you prepare for roles at these firms as well, offering case training and test practice relevant to their hiring styles.
Consulting firms use various assessment tests to screen candidates and ensure they have the right skills for the job. These tests may include:
Case Studies: A business scenario where you need to devise a solution. Case interviews test your analytical, problem-solving, and communication skills.
Common Case Interview Question Types
Profitability Analysis – Diagnose why a company’s profits are declining.
Market Sizing – Estimate the size of a market or volume of sales.
M&A and Entry Strategy – Recommend whether to acquire or expand into a new market.
Operations – Improve efficiency, reduce costs, or streamline logistics.
You’ll be expected to ask clarifying questions, structure your thoughts, and communicate your approach clearly. Our case interview simulations walk you through each of these types with real-world examples and solutions.
Personality Tests: Used to assess your fit within the company’s culture and values. These tests help consulting firms understand how you approach decision-making and team dynamics.
Numerical Reasoning Tests: These tests assess your ability to interpret numerical data and make decisions based on it. These are especially common in firms like McKinsey, BCG, and the Big 4.
Situational Judgment Tests (SJT): These tests evaluate how you respond to hypothetical work scenarios. Firms like Bain and PwC use SJTs to assess your decision-making and interpersonal skills.
At JobTestPrep, we offer exclusive practice tests for all these types of assessments, ensuring you're fully prepared for any challenge.
Our Consulting Bundle is designed to help you succeed in the hiring process for the following roles:
Whether you're applying for a junior consultant position or an executive role, our Consulting Bundle covers everything you need to prepare for interviews, assessment tests, and the overall hiring process.
Whether you're applying as an entry-level analyst, a mid-level consultant, or an executive assistant, each role comes with different expectations:
Consultants and Managers – Emphasis on case interviews, business acumen, and leadership potential.
Executive Assistants – Focus on multitasking, attention to detail, and situational judgment.
Accountants or Advisory Roles – Heavier focus on numerical reasoning, report writing, and professional judgment assessments.
The bundle is customizable based on your target role and experience level.
McKinsey Solve Game: Prepare for the McKinsey Problem Solving Game with practice tests and strategies.
BCG Pymetrics: Practice for the 12 Pymetrics Games used by BCG, Accenture, and other leading firms.
Bain SOVA Assessment: Prepare for Bain’s SOVA Assessment, including numerical, verbal, logical reasoning, and personality tests.
A case interview is a problem-solving exercise used by consulting firms to test your ability to analyze business problems and come up with structured solutions.
To prepare for McKinsey’s interviews, practice case studies, problem-solving games, and behavioral questions. Our McKinsey prep pack is designed to help you succeed.
The Big 3 (McKinsey, BCG, Bain) primarily focus on strategy consulting, while the Big 4 (Deloitte, KPMG, PwC, EY) offer a broader range of services including audit, tax, and financial advisory in addition to consulting.
A Fit Interview evaluates your personality, motivation, and cultural alignment with the company. It usually comes before or after case interviews and explores your past experiences.
Practice articulating your ideas clearly while listening actively. Avoid dominating or withdrawing — the key is collaboration under pressure.
Yes, the STAR method (Situation, Task, Action, Result) is ideal for behavioral questions. It helps structure answers that are concise and impactful.
Practice with simulations that mirror the real games. Focus on being consistent, alert, and emotionally balanced across tests.
Thousands of candidates preparing for top-tier consulting roles choose JobTestPrep because we offer:
Practice packs tailored to each firm and role
Full simulations of McKinsey Solve, Pymetrics, SOVA, and more
Behavioral interview prep using proven frameworks
Real-time performance feedback and tracking
Our goal is to help you go beyond memorization—and think like a consultant from day one.
