In general, internships are for students and recent graduates. However, IF (and that's a big "if") you can legally work in the U.S., there are many jobs where you can get "one the job training" or learn the industry and climb the career ladder. Taking university classes at night while working during the day is also a time-honored way to better yourself. (Interns are unpaid employees, but they are employees, so you do have to be a legal resident even for an internship.)
There are many counties that issue BTEC qualifications. The country that issues BTEC qualifications is the country known as England. Wales also issues these.
Overseas qualifications may mean qualifications that are acquired from outside the country. It may also mean qualifications that allow a person to work outside the country.
any country can do the Olympics
What country do you currently live in?
What country or region do you currently live in?
In which country or region do you currently live?
It varies from country to country. See the links below.
They have to be part of the British Commonwealth
This is the situation of my country currently. This is a sentence ending with the word currently.
What country do you currently live in?
I currently reside in the United States.
Not currently.