sorry about my vague question. the problem is: the school that my friend attends is not accepting exchange students anymore, because they already have too many of them. so, to live with him and finish my exchange program, i would have to leave my exchange organization and be as a "son" in his house, with a letter from my real parents allowing me to live with them, so i could attend the same school as he does. my question is: would i need to change my visa to go live with him, dropping my exchange program?