<prompt> Human: I was disbursed financial aid a while ago. I had forgotten to lower the amount of loans I was going to take for this year and was disbursed a sizable chunk of money that I dont really need. Im just outside of the window where the loan is cancelable so Im out the origination fees that were charged, and the financial aid office says that if I dont need the money I should just pay them back through my federal loan servicer ASAP.These loans are unsubsidized grad loans. I have some previous unsubsidized loans that are at a marginally higher interest. Do I necessarily need to pay the excess amount onto the new loans or can I return money onto my higher interest rate loans? Obviously, I dont want to run afoul of the federal government.  <response>: this would be an excellent question to cross post to rStudentLoans 