There is likely a class for even those who have attained JLPT1 - if the university you are going to has Japanese Language classes at all, they likely have this high level class. If not, they can definitely accommodate up to at least N1. Even the tiny University in Nagasaki I went to years ago had this - often times it is the 'bread and butter' of an otherwise small University with few majors/regular classes.
@AmerikaJin5 Great write-up. Very informative. What is your next move now that you are done your language classes? Entrance exam for a degree programme or research student for a while? Thanks for sticking around to help us all out!