I came to Japan back in September through a study abroad program and have since been studying in a Japanese High School under a 1 year Pre-College Student residence. Since I have already completed High School back home, and learning Japanese in a High School isn't quite working out, I wish to further my education by going to a Japanese language school to study Japanese and only Japanese. After visiting several of them, it seems that I met all their requirements, and I could theoretically start as soon as January. However, when I presented this to my exchange program, I was told that it was impossible to change schools because they were my visa's current guarantor. This, however, sounded quite odd to me, seeing as all the language schools I visited said it was fine that I already owned a Pre-College Visa. I therefore ask what the best course of action is, and what exactly the legality of me simply switching schools is. Any help is much appreciated.