USMLE Step 1 Official Practice Questions

Official Practice Samples of the USMLE 2013-16.

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How to write a USMLE question

USMLE writing guide

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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