Is iUniversity Prep a charter school or a home school program? No. iUniversity Prep is a tuition-free Texas public school that’s part of the Grapevine-Colleyville ISD. That means iUniversity Prep is subject to the same laws, accountability, and curriculum standards that govern all public schools in Texas. Does a student have to reside in Grapevine-Colleyville ISD to attend iUniversity Prep? No. All Texas residents in grades 5-12 who meet eligibility requirements may apply to