Although there is ample time between now and the 2014 All-Region audition, that time will fly by. With your time being divided between marching band, academics, social life and your other pursuits a training plan is a must for eliminating the element of chance. Every year I talk with my students about the number of weeks until the audition divided by the number of measures to learn in each etude. If you commit to calm, patient and methodical practice of a specific number of measures per week you can still devote the essential time to your daily routine and trumpet studies. The podcasts on these etudes will cover those small weekly amounts.
Texas requires etudes that lean towards the technical extreme of even very mature high school trumpeters. Although the challenge is sure to push the technique of many trumpeters, others are overwhelmed and lose ground where their simple fundamentals are concerned.
A small amount of planning mixed with stable consistency will see you through this trap.