If you want to renew student loan, you have two options,
First, you can negotiate to your loan provider for renewal of student loan, they will reschedule your loan so that you could maintain it easily, most of the companies offer Student Loan rescheduling.
Secondly, you can consult with another student loan company for a second student loan. Some companies offer student loan to students with bad credit history. You can manage your first loan with this second loan.
I suggest you to try maximum for the first option because for second student loan with bad credit history, you will have to pay doulbe interest.