i need help with audition music piece?

Without knowing what the piece is, what publisher's edition you are using, and who you are auditioning for, it's impossible to say. If you understand the work & what the composer was trying to get at, you can often get away with your own liberties. An edition is, after all, only one editor's opinion, however well informed, of how a peice should be performed. On the other hand, if your auditioner is an autocrat, as in a conservatory type who believes there is only one "correct" way to perform something, you'd best go with what the prescribed audition says.

If depends on the music. The breath mark may be there for effect. It might be that the composer wants you to crescendo into the breath mark and then take the breath to cause a sudden break in tension. This could be used in modern pieces as a way to kill a growth and add drama. So, without seeing the music, I cannot make a definite choice as to take a breath or not. However, remember that things may be there for dramatic effect if they do not seem logical or they may be printed every time just because it is a basic printing.

well if it is an audition piece then im assuming its a solo, and when you audition like this a HUGE thing you need to do is make the piece your own, not change it, but put your own style in it, and lots of emotion. but style things like rests and crescendos and dynamics you can change according to what kind of emotion you want to put out. So yes, if it feels right to you, take out the breathe mark, if you pull it off with a good tone and good emotion it will be just fine, and no you cannot get marked down for taking out a rest (unless it sounds doesnt fit in with the style your portraying). i hope this helped.

What are you playing? And are you auditioning as a soloist or for part of an ensemble, or are they looking for an accompanist for a singer? You don't say.

If this is classical music, there is less leeway for "interpretation". If you are supposed to be playing with others or if you a playing for a singer--you better NOT be ignoring anything!