USMLE Step 1

USMLE.org

What content is tested on USMLE Step 1?

Samples 2019

Tutorial and practice

NBME Subject Examinations (samples)

Official Practice Samples of the USMLE 2013-16.

BLOCK 1
BLOCK 2

How to study for the USMLE

How to write a USMLE question

USMLE writing guide

Disclaimer:

* NBME does not sanction or have any affiliation with any test preparation
courses or other publications. This site is not connected with the 
NBME or USMLE in any way.
Students applying to take the USMLE should go to the USMLE website 
directly for all orientation materials and other information about
the examinations, and the NMBE cautions students that materials
from sources other than the USMLE website may not be
representative of the most up-to-date USMLE information.

Source of explanations: benwhite.com