Navient is servicing my son 's student loans. He has XXXX : XXXX at 7.5 % variable, XXXX at 2.75 % variable, and a XXXX at 2.25 % variable. We have been sending payments on all XXXX, with specific loan numbers on each payment, and with larger payments on the higher rate loan to try to pay it off earlier. Navient has been posting the payments proportionately by outstanding balance on each loan, rather than the loan number stated on the payment, thereby causing higher interest to be accrued since his loan with the 7.5 % rate is receiving only a portion of total payments rather than the larger amount being sent. This is abusive and should be rectified by reducing the 7.5 % loan accordingly.