Um, not to be pessimistic, but don't expect your check until after classes have started, your rent, utilities, etc... have been paid, and the first round of books purchased. At some schools, you will also need to have paid medical insurance, and the cost of immunizations/titers if you don't get them done earlier in the Summer. (Cost us @500.00) My husband's MS1 orientation started the 2nd week of August, and we didn't get any money until the beginning of September.
If you are living in on-campus housing, they might allow you to pay August rent when Fin. Aid comes in, but doing that with any deposits, etc.. is highly unlikely. You can also put off purchasing some text books for awhile, but that means you will most likely forego any used book sales, which can save you HUNDREDS of dollars in the long run.
But don't worry, it gets worse. Your first check for 3rd year will come in approximately TWO months AFTER you start your rotations. Nice, huh?
Just save up, and cross your fingers!