I entered the USA on a B1/B2 (visitor) visa in 2014, but have changed status to an F1 (student) visa since then. I'm legally maintaining my student status by attending classes in language school (English). This is not a university program and I speak English well.
I want to stay in the US as I'm preparing for certain licensing tests in the medical field. What is the procedure to exit and re-enter? My F1 is not stamped on my passport. Will I have to go to my home country and apply for a new F1 visa to re-enter the US?