US board exam preparation is expensive. UWorld subscriptions, MKSAP, board review courses, and NBME practice forms add up to hundreds or thousands of dollars. For medical students carrying debt and residents on trainee salaries, the question of what is available for free is a practical concern.
This guide catalogues every free or no-cost option for USMLE and US board preparation in 2026 and provides an honest assessment of what free resources can and cannot do.
The Free Options
iatroX (US) — Free AI-Adaptive Q-Bank
iatroX offers a free AI-adaptive Q-bank covering Internal Medicine, Family Medicine, and Emergency Medicine. The adaptive algorithm identifies weak areas from your performance data and targets them automatically. Spaced repetition schedules reviews at optimal intervals.
iatroX is relevant for Step 2 CK, Step 3, and board certification (ABIM, ABFM, ABEM). It is not a Step 1 resource (Step 1 is now pass/fail with different content requirements).
Strengths: genuinely free with no question limits. AI-adaptive targeting. No trial period — full access.
Limitations: narrower topic coverage than UWorld. Best used as a supplement for weak-area drilling rather than as a sole resource.
AMBOSS — Free Questions
AMBOSS offers a limited number of free questions alongside its paid subscription. The free content is useful for evaluating the platform before committing. AMBOSS also occasionally runs promotions offering extended free trials.
The AMBOSS knowledge library articles are partially accessible for free and provide excellent clinical reference material — useful for understanding the concepts behind questions even if you are using a different Q-bank.
NBME Practice Forms — Official Self-Assessments
NBME self-assessment practice forms are available for purchase (typically $20–60 each) but represent the closest simulation of the actual exam. They are not free, but they are the most cost-effective investment for score prediction.
Some older NBME forms have been released for free or at reduced cost. Check the NBME website for currently available options.
UWorld Free Trials
UWorld occasionally offers free trial periods (typically 7 days) for new users. These trials provide full access to the platform and are useful for evaluating whether UWorld's style and depth suit your learning approach.
The trial period is too short for meaningful exam preparation, but it is enough to confirm that UWorld should be your primary investment.
Institutional Access
Many residency programmes provide institutional access to Q-banks and board review resources. Before purchasing anything individually, check what your programme, hospital, or medical school provides. Common institutionally-funded resources include UWorld, MKSAP, AAFP Board Review, Rosh Review, and AMBOSS.
Is Free Enough?
The honest answer for USMLE Step exams: probably not as a sole resource. UWorld's 3,000+ questions with detailed explanations are a meaningfully different experience from smaller free banks. The investment in UWorld is the single highest-return expenditure in US medical exam preparation.
However, free resources like iatroX serve a specific and valuable role: targeted weak-area drilling alongside a primary paid resource. Using iatroX's adaptive mode to focus on topics where your UWorld performance is weakest is more efficient than doing random UWorld blocks — and costs nothing.
The honest answer for board certification (ABIM, ABFM, ABEM): free resources can play a larger role. If your programme provides MKSAP or Rosh Review institutionally, supplementing with free iatroX adaptive sessions may provide sufficient preparation without additional personal expenditure.
The Recommended Free Stack
Primary adaptive Q-bank: iatroX US (free, AI-adaptive, Internal Medicine + FM + EM).
Knowledge reference: AMBOSS free library articles.
Score prediction: NBME practice form (small cost but essential).
Institutional resources: check what your programme provides before buying anything.
If one investment is possible: add UWorld. Nothing else comes close for primary USMLE preparation.
Information based on public sources as of 21 April 2026. Trademarks belong to their owners.