val Port Jefferson Free library eprep eprep The Port Jefferson Free Library is proud to introduce e-prep for use by our library patrons. E-prep is a unique study program that offers the benefits of private tutoring on-line. To begin e-prep, you must register with them as a Port Jefferson Free Library patron. After you are confirmed as one of our patrons, you will be prompted to use e-prep online. Please enter your library barcode and pin below and click Submit. Barcode: Pin: