USMLE (United States Medical Licensing Examination) is a medical licensure conducted by Federation of State Medical Boards (FSMB) and National Board of Medical Examiners (NBME). Scores range from Step 1: Pass/Fail; Step 2 CK and Step 3: 1 to 300, valid for 7 years (varies by state medical board requirements). Accepted by Varies (Recognized by all 50 US State Medical Boards and thousands of residency programs)., the exam fee is $670, with extremely high difficulty level.