How to train for a 1 mile volleyball tryout?

Hi! I am a 5'11 high school volleyball player hoping to make it onto varsity this fall. On mondays and wednesdays this summer I am doing an intense workout including "jump" training, weights, and running. I have never done well on the mile during fitness tests at school, and I want to prove to my coach that I can make varsity. Any thing I can do to get a good time on the run this august?