Healthcare

USMLE Step 1

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USMLE Step 1

United States Medical Licensing Examination — Step 1 basic sciences

20-question mock20 min74% pass markUnited States

Single questions with instant feedback — no timer, learn as you go.

See official guidance ↓
Start here · Official guidance

From practice to the real exam

01
Confirm eligibility
USMLE Step 1 is taken by MD students after pre-clinical years (US-LCME schools) or by IMGs registered with ECFMG.
02
Apply via NBME or ECFMG
US/Canadian MD students apply through NBME; international medical graduates through ECFMG.
03
Use UWorld + First Aid
Industry-standard third-party prep. NBME also offers official self-assessments (NBME forms) that closely mirror the real exam.
04
Schedule via Prometric
Test centres globally. USD ~660 application fee (US/Canada MD) or ~USD 1000 (ECFMG path).
05
Sit the exam
8-hour single day, ~280 questions in 7 blocks. Reported as Pass/Fail since Jan 2022.
Official resources
Heads up: Links open in a new tab and go to government / awarding-body sites. AceMark is not affiliated — always verify deadlines and fees on the official page.
Exam blueprint

What this exam covers

5 topics · drawn across your practice and mock
01Pharmacology
28%14 questions
02Biochemistry
22%11 questions
03Pathology
18%9 questions
04Microbiology
18%9 questions
05Physiology
14%7 questions
Your study path
Master this exam, topic by topic
Drill one topic at a time. After each session you'll see where you went wrong and can retake until you've got it.
Questions per session
View full mastery board →
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Frequently asked questions

Is the USMLE Step 1 practice test free?

Yes. The core USMLE Step 1 practice on AceMark is free to start — no credit card needed. Sign in (takes 10 seconds) if you'd like to track your progress, save attempts, and unlock the Mentor. Otherwise, browse and explore questions without an account.

How many questions are in the USMLE Step 1 quiz?

Each USMLE Step 1 attempt draws 20 questions and runs for about 60 minutes under realistic timed conditions.

Can I retake the USMLE Step 1 test, and are the questions randomised?

Yes. Every attempt pulls a fresh, randomised set of questions, so you can't memorise your way through — you retake it until you genuinely know the material.

What score do I need to pass the USMLE Step 1?

The pass mark used in this simulation is 74%. AceMark scores every attempt instantly and shows which topics to review.