Run a free, AI-graded case interview drill on each MBB skill with no account and no credit card. Frameworks, math, market sizing, and more.
Updated Jul 18, 2026. Reviewed by Ned.
The CoachNed drills picker is the no-signup entry to the AI-graded drill engine. You see six MBB drill types, pick one, and run a single graded rep in well under two minutes (math drills run 30-45 seconds; structuring and market sizing closer to 90-120 seconds). The first rep on each skill is free without an account. After that, a free signup at /try includes free daily drills, with weak-spot tracking.
What the Picker Looks Like
Six drill cards, one per skill, with a one-line description of what the drill tests:
### Frameworks Practice clear case structures before the interviewer pushes back. Sign up for drills### Brainstorming Organize ideas quickly and sound expansive instead of random. Sign up for drills### Case Math Sharpen core case math in short, high-pressure reps. Sign up for drills### Market Sizing Stress-test your sizing logic with realistic prompts and follow-ups. Sign up for drills### Exhibit Analysis Read exhibits faster and call out the so-what with confidence. Sign up for drills### Synthesis Turn messy analysis into a crisp recommendation. Sign up for drills Click any card. The drill opens directly with a real case-style prompt and a timer. No mode picker, no level selection, no friction.
Why the No-Signup Pattern Matters
Most case interview prep tools require an email before showing you anything. The drills picker is intentionally built the other way: prove the tool works first, ask for the email after.
The reasoning is conversion math. Most candidates create an account after seeing one specific AI grade, a sharper signal than a generic "you'll get drills if you sign up." The first-drill-without-signup pattern was added in 2026 specifically to fix the friction that was losing potential users at the email gate.
Sample Drill: What the Math Drill Actually Asks
A representative Case Math prompt from the picker:
** A market grows at 12% annually. Using the Rule of 72, approximately how many years until it doubles?
You type your answer. The AI grades:
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Final number (correct or not)
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Did you state the formula (Rule of 72: 72 ÷ growth rate)
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Did you carry units (years, not just a number)
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Business interpretation (did you tie the doubling time to a case context)
The grading takes about 5 seconds. The feedback specifies which dimension scored weakest and recommends the next drill. That's the difference between a generic ChatGPT math problem and an MBB-style graded drill, the same grading you'd see on the seven-dimension scorecard on a full case.
Try it right here. This is the live drill, not a screenshot:
case math from the CoachNed drill engine. Answer a real prompt and get AI-scored feedback. Free accounts include daily drills.
How the Picker Compares to ChatGPT Drills
Most candidates run ChatGPT drills first because they are unlimited and free. The picker is structurally different:
| Pattern | ChatGPT drill | ★ CoachNed picker |
|---|---|---|
| Setup time | Re-prompt every session | Click card, drill opens |
| Grading consistency | Drifts; sycophantic by default | Same rubric every time |
| Specific feedback | Generic, varies by prompt | Tied to formula, units, business meaning |
| Mobile-friendly | Works in app | Built for phone screens |
| Pattern detection | None (no session memory) | Activates after free signup with AI Coach |
For unlimited daily volume, ChatGPT with strict prompts is fine; see How to Use ChatGPT for for templates. For consistent grading and weak-spot tracking, the picker plus a free account is the upgrade.
Run a free drill, no signup
Six MBB drill types. Pick one, answer in under 60 seconds, see AI grading. No account needed for the first rep.
When to Use the Picker vs the Full Drill Engine
The picker and the full drill engine are the same product surface; the difference is signup state:
| Use case | Picker (no signup) | ★ Full drill engine (free account) |
|---|---|---|
| Try the tool for the first time | Yes; fastest path | Skip ahead if you already trust the format |
| Daily 15-min reps | Limited (one rep per skill) | Daily graded reps |
| Weak-spot tracking across sessions | No | Yes |
| AI Coach drill recommendations | No | Yes (after a full graded case) |
| Mobile commute practice | Yes | Yes |
| Send to a friend who is skeptical | Yes; no email gate | Requires their signup first |
For first-time users, the picker is the right entry. For active prep, create a free account after the first rep to get free daily drills, and run a full graded case to put the seven dimensions to work.
What to Drill First if You Have 5 Minutes
Most candidates have a single dimension that has been weak across the last 2-3 cases. Match the drill to the weak dimension:
What to drill first
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01Math errors are killing your case scores. Run Case Math drill. The formula + units feedback is what fixes the pattern.
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02Your structure is not MECE. Run Frameworks drill. The MECE depth feedback flags the specific overlap.
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03You ramble before synthesizing. Run Synthesis drill. The 30-second timer forces hypothesis-first ordering.
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04Charts feel slow to read. Run Exhibit Analysis drill. The 60-second prompt builds chart reading speed.
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05Market sizing feels random. Run Market Sizing drill. The top-down vs bottom-up assumptions get graded.
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06Brainstorming feels narrow. Run Brainstorming drill. The MECE bucket feedback widens your idea generation.
Pick one. Run it. Read the AI feedback for 60 seconds. That's the entire pattern: one rep, one specific score, one drill recommendation pointing to the next dimension to work on.
Verdict
The drills picker is the simplest way to evaluate CoachNed. No email, no credit card, no mode selection. One drill, under two minutes, specific AI feedback. If you have doubts about whether the tool works, start with the math drill or the structure drill before deciding.
Once the first rep validates the format, create a free account for free daily drills, weak-spot tracking, and AI Coach integration with full cases.
Sources and Further Reading (checked June 17, 2026)
- The starter math and structure drills, the free tools hub, and a free graded case are all linked in the relevant sections above. See the Related Guides below for the full set of feature pages.
Run your first drill in 60 seconds
Six MBB drill types, AI-graded, no signup for the first rep. Pick one, answer, see specific feedback.
Related Guides
Frequently asked questions
What is the CoachNed drills picker?
Most candidates run ChatGPT drills first because they are unlimited and free. The picker is structurally different:
Do I really not need to sign up?
Most case interview prep tools require an email before showing you anything. The drills picker is intentionally built the other way: prove the tool works first, ask for the email after.
How long does each drill take?
** A market grows at 12% annually. Using the Rule of 72, approximately how many years until it doubles?
Can I run drills on my phone?
Most candidates run ChatGPT drills first because they are unlimited and free. The picker is structurally different:
What does the AI grade for each drill?
** A market grows at 12% annually. Using the Rule of 72, approximately how many years until it doubles?
How is the picker different from the full drill engine?
For first-time users, the picker is the right entry. For active prep, create a free account after the first rep to get free daily drills, and run a full graded case to put the seven dimensions to work.