The best way is to set Automatic fees reminders.

Let Classpro be your useful tool for this particular dilemma, You can follow the steps given below:

  • Click on Settings tab 
  • Click on Branch Settings -> Messages

  • Scroll down for the Fees Reminder section.
  • Edit the 'No. Of Days' to send the fees reminder before the due date.
  • Click on Save Changes button below.