The Prep Expert offer is for $400 off all Prep Expert courses. Log into your SoFi account, click on your photo icon, using the mobile app and select 'Member benefits' OR select 'Membership' if logging in via the web. You will see the 'SAT/ACT Test Prep' tile where you can click on the "Sign up at Prep Expert" button.
For specific questions or more details about Prep Expert, please contact Prep Expert Customer Service directly by email at support@prepexpert.com or by phone at (877) 345-PREP (7737).