USMLE Vault · Step 1 & Step 2 CK

24 hours of an NBME day

Q: How should I take a full NBME practice exam?

Like the real exam. Start at 7:30 or 7:45 am, with your phone away 30 minutes before. 10 blocks of 20 questions, 30 minutes each, timed and offline. 40 to 45 minutes of total break time: 3 deep breaths after every block, and a 5 to 6 minute break after every 2 blocks with the restroom, water and glucose. Keep glucose high; the fuel is glucose, not caffeine. Review your incorrects the same day, within 24 hours at most.

You're giving a full NBME this week, Step 1 or Step 2 CK. Here's how to spend the 24 hours of that day.

By Dr. Marish Asudani · Published 22 October 2026

How should I take a full NBME practice exam?

Like the real exam. Start at 7:30 or 7:45 am, phone away 30 minutes before. 10 blocks of 20 questions, 30 minutes each, timed and offline. 40 to 45 minutes of total break time: 3 deep breaths after every block, a 5 to 6 minute break after every 2 with restroom, water and glucose. Review your incorrects the same day.

Most IMGs give an NBME at 4 pm, on the phone between blocks, with a 20-minute lunch in the middle. Then exam day is the first time they've ever done it properly. Your NBME day is a dress rehearsal.

Here is the whole day, hour by hour, and why each part is there. The why matters, because you'll repeat this routine on every NBME until you don't have to think about it.

Before 7:00 amWhy you start in the morning

You give the NBME in the morning because you need to simulate the exam. Step 1 starts in the morning. Your brain has to learn to decide fast at 8 am, not at 8 pm.

So you begin at 7:30 or 7:45, and you give the NBME exactly as you would give the exam.

7:00 – 7:15 amPhone away

You cannot be touching your phone for 30 minutes before the exam. Not the group chat, not a last Anki review, not the news.

And once you start: no phone, no breaks outside the structure, no pausing in the middle of a block. Exam day is not the time to figure out your habits.

▶Neil Randy · Test anxiety series: demos and strategiesFor the 30 minutes before block 1, if nerves are your problem. Watch it on a normal day, not this morning. YouTube playlist.

7:30 – 7:45 amBlock 1 starts. Timed mode.

It's 10 blocks of 20 questions each, timed to 30 minutes per block, and you give it in timed mode. NBMEs are always taken offline. The online version gives you 50 questions in 75 minutes. It feels comfortable, and it inflates your score by 4 to 6%, so you'd be training for an exam that doesn't exist and booking a date on a number that was never real. Offline, 20 questions in 30 minutes is the real exam's pace. Why offline, in full →

Inside every block, 2 passes:

First pass in 23 to 24 minutes. Question 1 to 20 without looking back. Know it, mark it, move.
Never more than 1 minute 20 seconds on a question. Stuck? Commit to your best answer, flag it, move on.
Torn between 2? Write B / C on paper, flag it, pick one, move.
Second pass: only the flags, in the 6 to 7 minutes left. Change an answer only if you find a line in the stem that rules it out.

The full method for solving a block: the NBME MCQ Protocol → · Why offline, and how: NBMEs offline →

▶Before giving your first NBME, watch this videoWatch it 5 to 6 days before your NBME. ▶How to solve NBME blocksMy video. The 2 passes, shown on real blocks. It's on your Vault schedule before NBME 27.

Between blocksThe break plan: 40 to 45 minutes, total

You only take roughly 40 to 45 minutes of total break time between all 10 blocks. Not more. This is how I recommend you take them:

B13 breathsB25–6 min B33 breathsB45–6 min B53 breathsB65–6 min B73 breathsB85–6 min B93 breathsB10

Dark = a block of 20 questions, 30 minutes. Green = a break.

After every block: 3 deep breaths, then the next 20. If you feel like getting up to reset yourself after 1 block, I'd recommend against it. Just take 3 deep breaths and give 20 more questions.
After every 2 blocks: a major 5 to 6 minute break. You use the restroom, you hydrate yourself, and you glucose yourself (why glucose →).

Why 40 to 45, and not the full hour? 40 to 45 minutes is right for an NBME. The rest of the break time doesn't disappear: it's still there on exam day, because the real exam is 14 blocks, not 10. 4 more blocks need that time.

Want to rehearse the full 14-block day, with every break, before the real one? Use the Vault assessment.

Rehearse the full 14-block dayThe Vault assessment: 14 blocks of 20, 280 questions, stems at real-exam length, and a system-by-system breakdown. Assessment 2 is free for every signed-in student.

Start the free assessment →

Every breakWhy you keep your glucose high

Your brain only uses glucose or ketones. You can't have ketones available instantly, so you have to keep your glucose levels high at all times. Your brain is in high-usage mode for 6 hours straight, so you keep taking glucose every 40 minutes.

Fast sugar: Tang or Glucon-D, chocolate, Dairy Milk. Half a bottle, or half a bar.
Slow sugar: Dairy Milk, chocolates and dates sustain you for longer, because they keep releasing glucose slowly.
Take both. The slow one carries you; the fast one tops you up.

By block 4 your mental fatigue starts climbing, and by the last blocks it's at its highest. Practise this routine on every NBME, so that on exam day you don't even think about it.

Caffeine? Some people take caffeine. When you take caffeine, you're stimulating your brain to work harder. If you're accelerating your brain, you also have to give it more fuel. The fuel is not caffeine. The fuel is glucose.

On an NBME day, that means glucose at every 5 to 6 minute break, and a slow sugar, like Dairy Milk or dates, that keeps releasing glucose in between.

About 1:15 – 1:30 pmDone

10 blocks × 30 minutes is 5 hours of questions. Add your 40 to 45 minutes of breaks, and from a 7:30 or 7:45 start you finish at about 1:15 to 1:30 pm. Eat a proper lunch. Then the most important part of the day starts.

Afternoon to nightReview your incorrects the same day

⭐ MOST IMPORTANT

You review your incorrects the same day, or within 24 hours at most. When you review on the same day, you remember exactly why you chose the wrong option. After 24 hours that reasoning fades, and you only see the answer.

Morning · take the NBME, all blocks, timedAM

Afternoon · score check: which questions are wrong, block by block. Not why yet.5 PM

Evening · full review: every incorrect, stem only firstEVE

Before bed · a one-liner for every incorrect, filed by systemNIGHT

For the full breakdown, tap here: the NBME Review Protocol →

TonightWhat to do next, based on your score

Your score decides your next 2 weeks. On the schedule, your first NBME picks 1 of 3 roads:

Road to exam day · Checkpoint: NBME 1

Above 70%Nothing changes. You carry on to the next checkpoint.

65–70%A 15-day Patch is added for your weak areas, then the plan resumes.

Below 65%A Rebuild block is added and your exam date moves.

Want a day-by-day schedule that tells you exactly what to study next? The Vault builds it around your exam date.

Show me my next 2 weeks →

The whole road: Week 1 to exam day →
Which form comes next: the exact NBME order → and the week before your next NBME →
Before that next form: the NBME Booster Anki, every form from 20 up to the one you took today, system by system. Open it in the Vault →
Stuck in the low 60s: Stuck at 62–65% →
It went badly: 24 hours after a bad NBME →
The night before the next one: the 1-page list →

Before your next form: the NBME Booster AnkiEvery form from 20 up to the one you gave today, system by system. Filter Pick & Mix by form so you only get the forms you need.

Open NBME Booster Anki →

Know your next 2 weeks tonight.

Enter your score. The schedule shows your road, every day, to exam day.

Open usmlevault.com/schedule →

usmlevault.com · free for your first 3 days