For IMGs about to open their first system, or stuck halfway through one.
By Dr. Marish Asudani · Published
How should I study a system for USMLE Step 1?
Study every system in 1 fixed order. Day 1: that system's micro and pharm, from the pills in the First Aid Guide. Then 1.5 days of active reading with the MCQs on every page, 1 day of Mehlman videos, and half a day of FA Foundation Anki. Then UWorld for that system. Same pages, 5 angles, and the system is finished when your last 2 blocks hold above 65%.
Read this first
This is only for you if you have roughly 10–12 hours a day for studying, and you're an intern or a graduate.
Working, or studying 5–8 hours a day? Keep the same order and stretch the days. Step 1 while working →
Cardiovascular is daunting. So is neuro. So is any system you open without a plan. Usually it's not the system. It's that students don't do it in a very structured way: they read a bit, open UWorld, score 40%, and switch resources.
Dr. S always struggled with renal. On this method he scored 85% and 95% on 2 UWorld renal blocks where the average was 64% and 62%. Same student, same First Aid, a different order. (His system, day by day →)
If you invest the time to do a system properly like this, pharmacology included, you become invincible. Every system page on this site (cardio, neuro, GI, and the rest) is this page with that system's numbers in it.
Before anything else · the order of the systems
Start with the easy systems. Do cardio last.
Begin with the easy systems: renal, respiratory and GI. Don't skip them, and don't save them for later. You begin with them.
Never start your prep with cardiovascular. It's the hardest system. Cardio is done last, after every other system is finished. It also stays freshest that way.
Here is the full order. Tap a system and it takes you to the guide for that system, day by day and hour by hour.
Ashna's Step 1 PASS report (Oct 2026). The bars show what Step 1 actually tests, system by system.
Read the right-hand column. Respiratory and renal together are 11–15% of the exam, and GI is 6–10%. Cardiovascular is 7–11%: the hardest system is not the biggest slice. That's why it waits until the end.
This is a 7-day system (cardio, neuro, GI, repro). The names matter, because each step does a different job.
Day 1Micro + pharmThat system's organisms and drugs, from the 2 pills in the First Aid Guide
Day 2 → Day 3 morningActive readingFirst Aid Guide, page by page, with the MCQs. 1.5 days
Day 3 afternoon → Day 4 morningActive applicationMehlman Medical videos for that system. 1 day
Day 4 afternoonActive recallFA Foundation Anki for that system. Half a day
Days 5–7UWorld + Anki revisionThat system only, the RPSR method
A 6-day system like renal or respiratory has 2 UWorld days instead of 3. Endocrine starts with half a day of pharm. Heme-onc has no micro or pharm list, so its reading starts on Day 1. Psychiatry swaps Mehlman for the Neil Randy playlist. Each system's page shows its own version, hour by hour: pick your system above.
Why order beats resources: every step uses the one before it. The MCQs only work after you understand the page. Mehlman only works after the MCQs. Anki only works after Mehlman. UWorld only works after all 4, and that's why opening it on Day 1 feels like failing.
Want a day-by-day schedule that tells you exactly what to study next? The Vault builds it around your exam date.
Open the First Aid Guide in the Vault → your system (what the First Aid Guide is). You will see 2 pills: Micro and Pharm. Each opens the exact list for that system, and nothing else.
The micro and pharm pills at the top of a system in the First Aid Guide (renal shown).
Micro · the WRWRT method.Watch the sketch at 1x with no notes → Recall the whole story in your head, in order → Watch again only the gaps at 1.5–1.75x → Read the Sketchy PDF for that organism → Test with the First Aid Guide MCQs for that organism.
Pharm · the FWRT method.Find the resource (already mapped: which drug from Sketchy, which from Osmosis, which from Dirty Medicine) → Watch each video twice → Read the High-Yield Pharmacology PDF after the whole system, and highlight what did not survive → Test in the First Aid Guide → your system → Pharmacology.
Doing the pharmacology from videos is extremely important. For a big system like cardio it takes half a day, 5 to 6 hours. That half day makes every drug page after it easy.
Why first: when you reach those diseases and drugs in First Aid 2 days later, you meet them as old friends, not new facts. Never done Sketchy? Do the same list from First Aid and the First Aid Guide alone. The list does not change, only the source.
Before Day 2What the First Aid Guide is, and why you read it
First Aid was written to remind you, not to teach you. Every line assumes you already understand it. That is why IMGs spend 3 hours on 1 page, Google half of it, and still remember nothing a week later.
The First Aid Guide on usmlevault.com puts the teaching back into every page:
Focus On: what on this page is high-yield, and what to skip.
Concept Walkthrough: the page in the order you should think about it.
ELI5: each heading in plain English, with the trap the exam sets. What ELI5 is →
How is this tested?: Common Confusion → Core Concept → The Trap → Your Approach.
Test Yourself MCQs on that exact page, with a Rule-out button so you practise elimination the way UWorld makes you.
Videos on the page for the topics that need them.
Renal p. 596: Key Takeaways, then How is this tested? (Common Confusion, Exam Reality), then Test Yourself.
Why you read it:60–70% of UWorld traces straight back to First Aid lines. A page you truly understood is a UWorld question you already own. See 1 page, opened up →
Open the First Aid GuideEvery First Aid page, page by page: Focus On, ELI5, the MCQs on every page, and the Micro and Pharm pills at the top of each system. Renal is free.
Day 2 → Day 3 morningActive reading, with the MCQs on every page
Active reading means that for every page you explain it, understand it, and do it. The MCQs are part of the reading. That is what makes it active.
Read Focus On for the page. Now you know what matters.
Run the Concept Walkthrough and the ELI5s. Explain each heading back in your own words, out loud.
Read the actual First Aid page. It should now read like a summary of something you already know.
Solve the Test Yourself MCQs. Any miss → back to that heading before you turn the page.
Pace: 10–12 minutes a page, 4–6 pages an hour, for 1.5 days. Do not memorise. Understanding is the only job. Each system's page splits its First Aid pages into the 2 reading days for you.
If a page still won't clickEach system page lists that system's Dirty Medicine, Ninja Nerd and Neil Randy playlists here. Watch only the video for the page you are stuck on, then go back to the page.
5
Day 3 afternoon → Day 4 morningActive application: Mehlman Medical
You understand the system. Now you learn how the exam asks it. Mehlman's videos take each high-yield topic and show you which clue rules an answer in, which one rules it out, and how to get from the stem to the answer.
Mehlman is a fixed step in every system, not an extra.
Videos, not PDFs. The value is the reasoning, and the PDFs do not have it.
That system's full playlist, in order. Watch the how-to video below first.
Pause before he answers, and answer it yourself. Any gap → open that First Aid Guide page and fix it the same day.
Short on time? Sort the playlist by date and watch the last 3 years first.
Why: active reading gave you the facts. Active application turns facts into decisions, and a decision is the only thing a UWorld question asks for. Each system page links its exact playlist. How to use Mehlman →
6
Day 4 afternoonActive recall: FA Foundation Anki
What it is: the FA Foundation Anki deck is First Aid, page by page. 2,499 cards across all of First Aid (as of October 2026), 1 high-yield point per card, and the First Aid page number is on every card.
How to use it: run that system's deck in half a day. Answer before you flip. If you hesitate, open that page in the First Aid Guide, read the line plus a couple of lines above and below, then go back to the card. On the UWorld days, clear the cards that are due before your first block.
Why: this is your third full pass of the system's First Aid pages, and the first one done without the page in front of you. Recognising a line and pulling it out of memory are different skills, and UWorld tests the second one.
Now you open UWorld. You are not meeting the system here. You are proving you already own it.
UWorld settings
QuestionsUnused
SubjectsAll
SystemsThat system only
ModeTutor, untimed
Block20 questions
Solve. Do 2 blocks of 20. Bookmark every question you got wrong and every one you got right by guessing.
Review in First Aid. For each bookmark, find the exact First Aid line it came from, highlight it, and read a couple of lines around it. 5–6 minutes a question, no more. Then the next 2 blocks.
Target:65% or above. If your last 2 blocks are under 60%, go back to the Mehlman videos for those topics, then the First Aid pages behind them.
A system is finished when every UWorld question for it is attempted, every miss is traced to its First Aid page, and your last 2 blocks held above 65%. Not when a date passes. When is a system actually finished? →
Later, for your NBMEs: the NBME Booster AnkiRetired NBME questions as cards, system by system, from forms 20 to 34 and the Free 120. Not for now: open it when your NBME phase starts. What the Booster is →
Do not open UWorld on Day 1. You will score 40%, decide you are bad at the system, and you are simply in the wrong order.
Do not read First Aid to memorise it. The reading days are for understanding. Memory is the Anki step's job.
Do not skip the page MCQs. If you cannot answer them, you read the page. You did not learn it.
Do not split a system across weeks. Do its days in a row. A half-done system behaves like an undone one.
Try it on the free system first. Renal is free on the Vault: every page, every MCQ, the Micro and Pharm pills. Run these 5 steps on renal, then do the next system the same way. Renal in 6 days →
The schedule places every system, and every prerequisite, for you.
Enter your exam date and your hours. Every system lands in the right order, with the right pages on each day.
Build my schedule →
