The financial aid department! They make things extremely difficult to get started, and they fight you on trying to pay them which seems rather silly. Make sure that you get things rolling WAY in advance so that you have time to fix everything they mess up.
On a day to day basis, the frustration I feel comes down to aesthetics. There is a lot of cement and little beauty. On a higher level, the most frustrating thing is how far behind the financial aid process is.
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