There are several band camps throughout Texas that specialize in working with young band students. At camp you will work with professional music teachers, play in a real band (with a real concert at the end of the week!), play games and participate in activities. Most of the camps are taught at University campuses.
Most of these camps have audition music and scales to place you in a band. Get the audition information for your camp as soon as possible! Most colleges host summer band camps, so if you have a specific school in mind, go to their website! Here are a few websites to get you started:
Texas Christian University
https://finearts.tcu.edu/music/events-and-programs/summer-camps/tcu-band-camp/
University of Texas at Arlington
https://www.uta.edu/music/areas/winds-percussion/concert-band-camp.php
Tarleton State University
https://www.tarleton.edu/summercamps/band.html
Stephen F. Austin State University
https://www.sfasu.edu/music/outreach/band-camp
Baylor Band Camp
https://www.baylor.edu/busmc/index.php?id=929126