Summarize the following:
Start memorizing your part as far in advance as you can. Memorize your lines or music exactly as you will be performing them in the audition. Practice your lines or your music over and over until you know it by heart.  If you are unfamiliar with a word, look it up and familiarize yourself. If a part is particularly tricky, give yourself extra time to perfect it. If you are asked to "cold read" either lines or music, don't sweat it! Stay focused on the lines or the music and get into the part. Saying your lines, playing the music, or practicing your dance routine in advance will help you confidently deliver your part during the audition. Find friends to rehearse lines with, reading off of the script. You can also recite your part or practice your choreography in front of a mirror. Also practice improvising your lines and going off book. The audition is based around how well you can get into your role, whether it be a dance, character, or musical performance. Embody your role by using an accent, altering your body language, or using props.   If you are auditioning for a guitar part, be the guitarist. Be confident and bold, and don’t worry if all eyes are on you during a solo. If you are auditioning for a play, ask yourself what the character would say or do. Infer as much as you can as if you were the character. Sight-reading, or “cold reading,” is reading material with little or no time to prepare in advance. In some auditions, you will perform music or recite lines without reviewing them before. Practice auditioning with unfamiliar work to become comfortable with sight-reading during your audition.  Find an unfamiliar play and practice acting out lines. Grab a piece of sheet music and start playing without looking at the entire piece.

Summary:
Memorize your lines, songs, or music. Rehearse with friends or in front of a mirror. Get into character by altering your accent, body language, or clothing if necessary. Practice sight-reading so you are prepared for anything.