I am a medical student. I am planning to go to the USA for my clinical electives, and applied for a visa on this basis. My visa got approved for 3 months and it expires on 30 March 2018. Under annotations, the duration of the electives program is specified, which is from 5 February 2018 to 3 March 2018.
I am planning to take an exam (USMLE Step 2 CS) while I am there, most probably on 20 March 2018. Does this annotation affect the length of my stay in the USA granted at the port of entry? Am I allowed to stay there after my electives end to sit the exam?