You need to pass Step I at UAG before moving on.
In regards to your last post regarding being able to finish med school at UAG without passing the USMLE I, this is no longer true. I think that UAG changed their policy regarding promotion into the clinical phase of the program. If you are a student in UAG's international program and you do not pass the USMLE I after the basic sciences, you will not be allowed to progress into the clinical phase of the program. So passing Step I is definitely a requirement not only for graduation, but also for promotion into the clinical phase. Hope this clarifies.
I don't think that everything is possible, but I do think that anything is possible!