Boss x
(You can't do PPL exams in one state and have them accepted in another as a rule.)
But it can be done if you get agreement between the country regulating authorities.
A couple of years ago I had a UK student who worked in Switzerland and was learning to fly in Zurich. She applied to both the UK and Swiss CAA who agreed that she could do her ground school and exams in the UK with me and her flying and skill tests in Switzerland.
We did it all in 2 weeks of 10hrs a day. If I remember correctly she passed them all first time.
She and her Swiss instructor had to work very hard with the Swiss authorities and we in the UK had to show we were an approved school and that I was F I qualified to give the ground school and that the UK examiner was also CAA approved.
Cheers ***