You need to contact your loan servicer. Your loan servicer or lender must provide you with a loan repayment schedule that states when your first payment is due, the number and frequency of payments, and the amount of each payment. This is for both federal and private student loans.
Loans
How can I find out who is my loan servicer?
Visit the National Student Loan Data System (NSLDS) to view information about all the federal loans you have received. The contact information for the loan servicer or lender is retrievable through NSLDS.