Need to live in Texas 12 months prior to enrollment. For a hs grad, most states then require a job and various ways to show you were self supporting and intend to settle there (not just biding time to get in-state rates.)
Here’s one resource. In general, you want to read as much as possible, catch any fine print. http://www.admissions.txstate.edu/future/residency/residencyrequirements.html
ACC may also have "in-district’ requirements.
Sorry about this wrench.