The exchange organization dictates an average C for all classes at any time in the exchange year. Since the exchange student has an D+ (all other classes are OK!) the organization will revoke his VISA. Hower, the Counselor and Principle of the High School officially declare he is allowed to stay till the end of this high school year. If the students follows all lessons like at high school like he did in the official exchange program, is he allowed to stay in teh US? Has the exchange organization the power/right to revoke the visa despite the visa was granted to the student personally by the US ambassade in the home country (Europe) of the student?