Your interpretation may be correct. However, it also fits the characteristics of an emotional restoration dream. If this is the case, this dream may be a reflection of your emotions regarding an incident or regarding your experience of the preparation process (school). It all depends on the trigger that initiated this dream.
My opinion is that this dream is the latter. If it is an emotional restoration dream then it does not really have a spiritual meaning except that you struggled emotionally with something at the time that you had the dream, and, it is definitely about spiritual preparation because of the school and the arguing between the two people that speaks of
conflict and emotions of anger.