Something to think about for after you graduate is refinancing your loans with companies such as:
https://commonbond.co/refinance-loanI believe that they refinance all types of loans, but I specifically looked at it for my law school loans. They're able to give really good rates because they look at other factors that federal loans don't such as the school that you are graduating from, whether or not you have a job lined up, and what your earning power is etc. So if you're going to a high-ranked school and will have a job upon graduation, you can save a few points compared to what your fed. loan rate will be.
Also, with fed. loans (at least for graduate school), interest accrues while you are in school, and upon graduation, all the outstanding interest turns into principal so if you're not refinancing, you may want to try to pay off the interest before you graduate (if possible).