I was told that ff u have plans on going into residency, don't let your lender know. Or else they wont consolidate ur loan, they will defer it, thus forcing you to keep a higher interest rate. Regardless of your plans let them know u graduated, consolidate, then call them back afterward and let them know you are back in school and of course prove it to them.
I don't know if this is completely accurate, can someone with personal experience comment further?