Out of State students don’t have to be brought to the State before they are 15, live here three years and graduate from a Texas high school to qualify for in state tuition.
In fact, anyone who lives within a County that abuts Texas can qualify for In state tuition, without moving to Texas before matriculation.
As the National Conference of State Legislatures notes in a report on in-state tuition for illegal aliens, in order to try and maneuver around the [§ 1623] requirements, the eleven states that have enacted laws granting in-state tuition rates to undocumented students have tried to word the legislation so that it is contingent on high school attendance and graduation, and not based on residency within the state.[xxiii] But Texas bases its definition of residency for college admission on an individual (or his parent) establishing domicile in Texas not later than one year before the academic term in which the student is enrolled in college or graduating from a Texas high school who maintained a residence continuously for three years before graduation.[xxiv]
live here three years and graduate from a Texas high school to qualify for in state tuition.
You can get a GED and still qualify for in-state tuition per the Texas law.