The situation for the character is this. He's a German citizen, working as a teacher at a private school in New York (gym, dance and German). All of his papers and so on are in order, and his employer has enough money and influence to pull strings for him - legally - should he need it.
The only problem is, he has no qualifications. As in, he never even went to junior school - he was homeschooled for various reasons, and has never sat an exam in his life. So my question is this. What would happen if, say, his visa came up for review/renewal and the immigration authorities realized that this unqualified, uneducated foreign national is teaching at a school?
Suggestions I've heard are that they tell him he'll have to get another job if he doesn't get qualified asap, or enforce at least a high school equivalency on him on threat of deportation, but I want to make sure I get it right.
So what would happen?