10 Management Consulting Interview Prep Tools and Resources Worth Your Time
- Giovanni Coeli
- Jun 11
- 16 min read
Most candidates I coach show me a prep stack of 15 different tools two weeks before their first round. They have 4 casebooks open, three YouTube playlists half-watched, a math drill app on their phone, a coach booked, and a peer mock scheduled for tomorrow, and two other websites they read from time to time for general casing knowledge. What they almost never have is a clear answer to the question: which of these is actually moving the needle?
I went through MBB recruiting myself last spring during my junior year and will start at BCG full-time in September. I prepared for both McKinsey and BCG first rounds with no consulting club, no on-campus recruiting, and no senior I could copy a prep plan from. So I had to figure out for myself which resources earned their place and which were just keeping me busy without adding much value. In my opinion, the students who get offers are not the ones who use the largest number of tools/websites. They are the ones who picked the right 3 or 4 and went deep with them.
This is my honest take on 10 interview prep tools and resources, what each one is genuinely useful for, how I would actually use it, and where it falls short. If a tool is on this list, I either used it myself or sent students to it and watched it work.
What do you actually need to prepare for a management consulting interview?
To prepare effectively, you need four core elements:
A Clear Blueprint: Understanding what a case is, how it’s composed, and exactly what each firm expects.
Underlying Skills: Mastering structured problem-solving for ambiguous scenarios, verbal structuring, mental math, exhibit reading, brainstorming, and synthesizing.
Live Rep Volume: Accumulating high-quality mock interviews with real case partners across a wide variety of cases.
Fit Preparation: Practicing behavioral components, which most candidates dangerously underweight until two weeks before the interview.
How long does it take to prepare for a McKinsey, BCG, or Bain interview?
It really varies by candidate but most students need eight to twelve weeks of focused prep to feel ready for a first round. A tighter range is more realistic if you already have a business background and can do the math and structuring deeply and quickly I cased through most of July before my August interviews, and I would do it the same way again. Underprepping is the biggest risk because there’s nothing worse than walking in wishing you had done more.
What it is: A paid platform built by a former McKinsey interviewer with structured video courses, around 100 cases, sample interview videos, and a Practice Room where you can find peer partners and book case swap sessions. Check with your university because this is usually free or heavily discounted if you access through your college’s link.
Best for: Candidates who want a one-stop shop tool that covers cases, fit, math and structure drills.
How to use it: If you have the time, start with the case interview prep course to lock in the standard the firms are actually grading you against. Then use the Practice Room as your main source of live mocks. The community is large enough that you can usually find a partner at your level every day and time of the week. The sample interview videos are also quite good: you basically watch "Strong" candidates solve a case, then you can immediately do the same case yourself (or pausing the video to follow along, then compare the two deliveries based on both content and executive presence
Honest limitation: It is paid (around $49 per month, unless free through your university), and the case library is smaller than what you can stitch together for free across MBA casebooks and other free sources. The videos should be free, meaning you are primarily paying for the drills and the Practice Room.
What it is: A free mobile app that drills mental arithmetic under time pressure. Addition, subtraction, multiplication, division, percentages, squares, fractions. You can adjust difficulty and number size. There is a paid Pro tier ($4.99 per month) that unlocks customization and a trainer mode, but the free version is genuinely enough - that’s what I used anyway.
Best for: Rebuilding raw mental math speed in the dead time of your day. If you have not divided $847 million by 23 or multiplied 48 by 73 in your head since you were 14, the first time an interviewer asks you to do it, you will freeze. The fix is not a $200 course, it is getting 50 to 100 reps a week of basic operations on a free app until the panic goes away.
How to use it: Open it in the 2-5 minute windows you already waste: in line for coffee, between classes, on the subway, while a meeting loads, etc. Do one or two rounds and close it. Do not sit down with it for an hour because that defeats the point and will make you less incentivized to reopen it. The goal is to come back to the app multiple times a day, especially closer to the interviews. IIt trains your mental math and builds your confidence every time you set a new PR. Around four to six weeks of this kind of drilling and your speed on percentages and multiple-digit divisions/multiplications/additions will visibly change.
Honest limitation: This app trains arithmetic, not case math. It will not teach you how to walk an interviewer through your math approach, insights, and next steps, or how to do multi-factor calculations / use the rule of 72 / do smart rounding. Those are different skills and the app will not get you there. For that, you need actual case math drills and full mock case sessions: making FastMath an excellent warm-up to supplement your full case workouts
What it is: A bank of 10,000+ component-level drills covering math (multiplication, division, percentages, grab-bag), case structure (prompts with model frameworks), brainstorming (questions with model answers), and exhibits (timed chart reads with model interpretations). Bundled inside MC's paid Case Library (~$200) or Black Belt program. Many US universities give students free access through career services, so check before paying.
Best for: Fixing a specific weakness you have already diagnosed from full cases. If you have done 10 cases, for example, and noticed your structure is always weak or the main area where you receive feedback, drilling 15 structures in one sitting will fix it faster than another 10 cases will. The exhibit drills are the most underrated piece because a real case only gives you one or two exhibits, so isolated exhibit drilling is how you can get 30 reps in 90 minutes as well as a lot of exposure to different types of charts and figures.
How to use it: Do not open these on day one of prep. You will not know what to drill yet. Do five to ten full cases first, then go back to your feedback log and identify the one component where you keep hearing the same critique. Drill that component for 30 minutes a day for a week. Then, at the same time, do full cases to test whether you fixed the issue. If you did, move to the next weakness. If you did not, ask for more specific feedback and go back to the drills.
Honest limitation: Drilling in isolation can become a trap. You will get faster on the drills themselves and feel like you are improving, but the real test is whether the skill holds when a human is watching and timing you, your structure is being interrupted and questioned, and you have to keep talking through the math. Drill, then case, then drill again. And the math drills can overlap with FastMath, so if you are already drilling arithmetic on your phone, prioritize MC's structure, brainstorming, and exhibit drills instead.
What it is: A paid library of 600+ cases organized by firm style (McKinsey, BCG, Bain, plus 20+ other firms), industry, function, and case type, each with full solutions. Sold as part of the All Access Pass or bundled into the Black Belt program. Again, many US universities give students free access through career services so check your career center before paying.
Best for: Doing targeted volume in the early and middle weeks of prep, especially when you want to filter for a specific case type or firm style. If you have a BCG first round in three weeks and you want to do 12 candidate-led market entry cases in healthcare, this is the only resource that lets you find them in two minutes instead of flipping through eight MBA casebook PDFs.
How to use it: Do not start here. Burn through the free firm-published cases and a couple of MBA casebooks first to build baseline reps. Once you are at case 15 or 20 and you have identified which case types you struggle with, filter the library aggressively. Pick a single dimension to work on for a week interviewer-led McKinsey-style, M&A cases, or operations casesand run six to eight of them in a row. Pattern recognition kicks in around case five, and that is the point.
Honest limitation: The realism varies. A lot of cases feel current and MBB-caliber. Some feel like they were written for a Big 4 candidate five years ago and never updated.
What it is: A free YouTube channel (around 50,000 subscribers, 3 million views) and blog by Taylor Warfield, a former consultant who writes modern, bite-sized content on market sizing, profitability, structure, the case types, and firm-specific guides (BCG Casey, McKinsey Solve, fit interview structure). There is a paid layer (a 7-day case course, a fit interview course, coaching) but the free content alone is enough for foundations.
Best for: Building a modern foundation in your first two weeks of prep, especially if you are starting from zero and do not have a business background. It is also has one the best free sources for firm-specific tactical guides on the digital assessments (e.g. Casey, Solve), which traditional casebooks do not cover.
How to use it: In your first week of prep, watch three to five foundational videos: one overview of what a case interview is, one on market sizing, one on profitability, one on case math. Take notes. Then close the tab. Come back only for specific tactical guides when you need them (the BCG Casey guide before your Casey assessment, the McKinsey Solve guide before your Solve, the firm-specific cheat sheets a week before each interview). Do not binge the channel. Binging 30 videos can easily become procrastination disguised as productivity, draining valuable time better spent on live practice.
Honest limitation: It is still YouTube, which means passive consumption with low retention. You will absorb maybe 20 percent of what you watch unless you actively take notes and apply it in a case the same week.
6. Your Own Case Prep Cheat Sheet (PowerPoint, Notion, or Docs)
What it is: A personal reference document you build yourself across your prep, organized by case stage and component. Mine was a PowerPoint presentation that grew over two months to a total of 19 slides. It started as a feedback log (general, structure, math, exhibits, brainstorming, recommendation) but evolved into a full prep “operating system”: driver's-seat phrases I could use on the day of the interview, exhibit and math playbooks, six pre-built structure variants (profitability, market study, growth, decline, M&A, pricing), a mini-MECE bank of 30+ standard splits, all the math formulas you need in one place (P&L, market, operations, M&A, etc.), memorized population and fraction reference numbers, and industry primers for the 11 sectors that show up most in MBB cases. Cost: zero. Build time: 20 minutes for the initial scaffold, plus 10 minutes after each case to update it.
Best for: Anyone doing more than 15 cases in their prep, which is essentially everyone targeting MBB. This is the lowest-cost, highest-leverage tool on this entire list, and it is the one most candidates never build. The value compounds in two ways. First, you start spotting patterns in your own performance you cannot see in your head. Second, the doc itself becomes an accelerant: instead of googling formulas mid-prep or rebuilding a market study structure from scratch, you have your own field manual to pull from. By week four, mine was the first thing I opened before any mock and, before my interviews, it was also the last thing I closed.
How to use it: Build the scaffold on day one: one section per case stage (recap, structure, exhibits, math, brainstorming, recommendation), one section for driver's-seat language you want to internalize, one section for structure variants you keep seeing, one for math formulas, one for industry primers. After every case, spend 5 to 10 minutes (not 30) updating it. Two kinds of entries: "feedback I received" goes under the relevant component section so you can spot patterns, and "language or framework I want to remember" goes into the reference sections so you can reuse it. Once a week, scan for repeats. The category with the most repeated feedback is your next drill target.
Honest limitation: This requires discipline that most candidates do not have. The first two weeks of building feel pointless because you do not have enough data yet, and the doc looks empty and embarrassing. The patterns and the value only emerge around case 10 to 15. If you quit before then, you got none of the value. The second limitation is feedback quality: garbage in, garbage out. If your peer mocks consistently produce vague "good job, be more structured" feedback, the log will just be a record of vague feedback. Push your case partners to give specific, named-moment feedback, and end the swap if they cannot.
7. 1:1 Coaching from Former MBB Interviewers
What it is: A 60 to 90 minute paid session with a former or incoming McKinsey, BCG, or Bain consultant who runs you through a case and gives you structured feedback. Sessions cost $150 to $500 each, with $200 to $300 typical for ex-MBB coaches with strong track records. Most coaching platforms (Wall Street Guide, CaseCoach, IGotAnOffer, MyConsultingOffer, Hacking the Case Interview) offer bundles at a 10 to 20 percent discount.
Best for: Two specific moments in your prep, and almost no others. First, around week two or three, when you have done 5 to 10 cases and you want a written diagnosis of where you actually stand and what to prioritize moving forward. Second, one to two weeks before a final round, when you want someone who interviewed at your target firm recently to calibrate whether you are walking in at the bar. The value of coaching is the structured, very specific expert feedback, which is something you’ll likely never get from peers inyour network.
How to use it: Use the first session as a diagnostic. Have a self-assessment and recap of where you are currently at ready, so the coach walks into the call already knowing what kind of case to give you. After the call, spend the next week(s) fixing those specific issues flagged by the coach with peer mocks and component drills. If you plateau with one coach and are not receiving any more feedback, go for a different one. Closer to final round, book one or two more sessions, ideally with a coach who interviewed/was an interviewer at your target firm in the last two years.
Honest limitation: Most candidates who get MBB offers do not use paid coaches at all. The resource is genuinely useful but the marketing oversells it. Coach quality varies more than the prices suggest, and a $300 coach who left McKinsey 10 years ago may calibrate you to a bar that has shifted. Ask when they last conducted an interview before booking. The second real risk is dependency: candidates who book five or six sessions often end up doing fewer total cases because they treat coaching as the only “workout” necessary, instead of an extra support. Also, two well-timed sessions usually beat six clustered ones.
8. Mock Cases with Current MBB Consultants
What it is: A 45 to 60 minute case run by someone currently at McKinsey, BCG, or Bain, followed by direct feedback in their actual firm vocabulary. There are three ways to get one: ask a warm networking contact you have been talking to for weeks; accept the firm-assigned mock that McKinsey, BCG, and some Bain offices offer between first round and final round; or get connected through a friend or recent grad to an incoming associate who was in your seat six months ago.
Best for: Calibrating your case performance to the actual MBB bar in the final two to three weeks of prep. This is probably the single most valuable (and free) resource on this entire list, and it is the one that is almost impossible to substitute.
How to use it: Do not ask cold. Ask only people who have already shown they are invested in your outcome. If your firm assigns you a post-first-round mock, treat it as the most important hour of your prep, not a casual touchpoint, even if your performance isn’t factored into the final decision. Take notes during the feedback. Rewrite your fit stories the same day if they flagged anything. For the assigned mock specifically: ask at the end if they would be open to a follow-up if you have specific questions before final round. Most will say yes.
Honest limitation: This resource compounds existing advantages. If you are at a target school with a strong consulting network, you will get three or four of these without much effort. If you are at a non-target with no alumni at MBB, you will get one or two only if you have put in months of networking first. The second limitation is feedback quality variance: a first-year associate gives you good "feel" feedback but a manager who has interviewed 10+ candidates this season will give you something closer to the actual scoring rubric. If you have a choice, push for the more senior person, but do not burn a relationship over it. One mock with anyone currently in the seat is worth ten with peers.
9. Business Model YouTube Series (e.g WSJ's "The Economics Of", CNBC's "How [X] Makes Money")
What it is: Free YouTube series that break down the business model of a specific company or industry in 8 to 15 minutes per episode. WSJ's "The Economics Of" is the strongest one and the one I actually used myself, with episodes on Costco, Spirit Airlines, Spotify, Disney, Trader Joe's, Chick-fil-A, and dozens of others which are really interesting. There’s also CNBC's "How [Company] Makes Money" series and channels like Wendover Productions, Modern MBA, and the Acquired podcast (longer-duration) which cover the same territory from different angles. Each resource gives you the revenue model, key cost drivers, competitive dynamics, the one or two metrics the industry is actually judged on in cases, and the recent strategic shifts.
Best for: Building real-world business intuition in dead time, especially if you do not come from a business background. This is the resource that fixes the single biggest gap I see in non-business majors during case prep: walking into a structure on an industry you have never thought about and giving a generic framework after freezing because you do not know the vocabulary. If you have watched the WSJ Economics Of Spirit Airlines and a low-cost airline case comes up during your interview, you already know load factor, fleet commonality, and the main cost drivers. And that is the exact language an MBB interviewer wants to hear when you structure. It is not a substitute for casing. It is the substrate underneath casing.
How to use it: Watch one or two episodes per week as background, not as a study session. Open it during dinner if you live alone, on the treadmill, or while commuting. Prioritize industries you have very little knowledge about e.g. industrials, energy, healthcare, logistics, etc., because cases in those industries are where most candidates sound the least confident and client-specific. After each video, write three things into your case prep cheat sheet (see tool #6): the revenue model in one sentence, the two or three key metrics the industry uses, and, for example, one strategic tension the industry is currently navigating. By week six, you will have a personal industry primer covering 15+ sectors, which is genuinely more useful than any paid prep resource for the business-sense part of the interview.
Honest limitation: Consumption can masquerade as prep. Watching 30 episodes feels productive and fun, but does not move case performance unless you actually translate what you watched into structure-ready vocabulary. The second limitation is coverage: airlines, fast food, and streaming are over-covered across these channels, and B2B industries, industrial sectors, and financial services beyond retail banks are under-covered. Supplement with industry primers from IBIS World or other case prep platforms/case books for the gaps. Also, the framing is journalistic, not consultant-style, so you have to translate the narrative version into structural sub bullets yourself.
10. LLMs (ChatGPT, Claude, Gemini) for Fit and PEI Prep
What it is: General-purpose AI tools used for two specific prep tasks they are genuinely good at. First, fit and PEI prep: you paste a story, ask the LLM to roleplay as a McKinsey PEI interviewer, and have it drill you with three to five layers of follow-up questions or even improve your stories overall. Second, building your personal framework library: you ask the LLM to brainstorm exhaustive sub-bullets under each bucket of a standard case structure (revenue, costs, customer, competitors, growth, deal, etc.) and then you organize, refine, and “memorize” the output. Avoid using them for full case practice, as LLMs do not push back welldo not time you, and tend to hallucinate on MECEness.
Best for: As I mentioned above,two distinct use cases. First, it acts as your sparring partner in dead time when you do not have a human to prep with or you want to go into flow state for 3 hours. Real PEI interviewers ask three to five layers of follow-up on a single story ("what exactly did the other person say back?", "why did you not escalate?", "what would you do differently?"). Most candidates only prep one layer. An LLM will keep drilling for as long as you want. For framework building, the use case is even more underrated. I personally built a 19-column Excel spreadsheet covering every standard case bucket (own company, revenue, costs, product, customer, competitors, growth strategy, deal, post-deal synergies, etc.), each with 5-8 sub-branches and dozens of bullet points per branch, which I then printed and attached to my bedroom wall.When I walked into my McKinsey and BCG interviews, I was pulling from a library of ~770 sub-bullets.
How to use it: For fit and PEI: paste a full fit story (situation, challenge, actions, outcome, learnings), ask the LLM specifically to roleplay as a McKinsey PEI interviewer and ask 10 follow-up questions including ones designed to expose weak spots in the story, then have it score the story against a rubric (clear situation, specific actions, measurable outcome, learnings, signs of self-awareness). For framework building: open a spreadsheet, list the 12 to 20 standard case buckets across the top row, then for each bucket ask the LLM to generate exhaustive sub-bullets. Update it after every case where you encountered a sub-bullet you wished you had ready.
Honest limitation: LLMs default to being supportive. If you ask "what do you think of this story?" or "is this structure good?" you will get a polite, generally positive response that will not help you improve. You have to specifically prompt for critical feedback or you will waste the session. The second limitation is that LLMs over-generate. Ask for sub-bullets under "Revenue" and you will get 40, most of which overlap with bullets from other buckets or you won’t need in an actual case. You have to curate a lot and keep only what a real interviewer would accept. The third limitation is that none of this replicates live delivery: the discomfort of being interrupted, watching the interviewer's face, the pressure of silence, talking to a 30+ years of experience managing director.
The pattern that actually wins offers
The students I coach who successfully secure MBB offers systematically rely on a streamlined selection of tools, choosing depth over sheer volume.They use fewer, and they use them in a sequence that builds on itself. Foundation in week one (a course, couple videos, a case book). Component drills in weeks two and three to fix weaknesses exposed by cases and logged into your case prep cheat sheet. Volume in weeks four through eight with peer and coaching mocks, casebooks, and library cases, as well as drills. And then targeted high-leverage reps in the final two weeks with a coach, mocks with a current consultants, targeted drills, FastMath reps, as well as refining of your feedback log and framework excel library leading up to the interviews.
If you are looking at a stack of 10 prep tools right now and feeling behind, the answer is not to add an 11th. It is to pick what works for you and your timeline, and to actually go deep on those.
Wall Street Guide mentors like myself have been through MBB recruiting at McKinsey, BCG, and Bain very recently. So if you want to talk through where you actually stand and which of these resources to prioritize for your specific situation, book a free session here.
Giovanni is a Master's in Management student studying at IENYC in New York and preparing to join BCG Miami full-time in September. He's lived and studied in 4 different countries, moving from Italy to Ireland, then Spain and now the US, and he's now helping undergraduates break into consulting through CV development, networking, and case prep. Outside of work, he's usually exploring a new corner of New York, running, taking photos, and exploring every neighbourhood of the city through events and get-togethers with friends.
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