Completing your degree is a goal. Each class is a large project. Each assignment is a subproject.
In this case there's no need to invoke an Area of Focus because there's nothing to "maintain". Every assignment you do moves you one project closer to the goal of graduating.
IMHO, AOFs and Goals exist on the same level. They are things you want to achieve and things you want to maintain. It is not always necessary to have them connected to each other.