Hey there USMLE stands for United States Medical Licensing Exam and it consists of 3 steps, Step 1 that tests your basic science knowledge , so you must read your subjects till 2nd year MBBS except forensic medicine and additionally read biostatistics and behavioural science ,then the step 2 with CK exam and CS exam which is for theory and practical respectively and they test your clinical subjects and they are the ones you learn in the 3rd and 4th year, and Step 3 is something you can give even as you do PG /Residency in USA,it will test your whole medical knowledge and the experience you gain from practising,hope this helps , good luck

Dear Kaviya, USMLE is the United States Medical Licensing Examination. This is for the US and Canadian students who have completed their Medicine and wish to practise in the US. For students who have completed their Medicine outside these 2 Nations, ECFMG ( The Educational Commission for Foreign Medical Graduates) offers a Certification programme to assess the readiness of International Medical students to enter Residency or Fellowship programmes in the US.