Details are now available re: the free (scored) practice test that will accompany the revised TOEFL iBT in July.
It will be available on July 26 and the website says it will have:
-a complete TOEFL iBT mock test
-additional practice for all four sections
-AI-powered automated scoring
-performance feedback for all four sections
-personalized feedback and tips for Speaking and Writing responses
-high-level sample responses for Speaking and Writing
Watch for it in the App Store, the Google Play Store and on the ETS website.