How do I leave a rehearsal for a high school play early?

I am going to rehearsals every Monday from straight after school to 5pm for a hs play. But also on a Monday I have a dance class that I am currently training for an exam that is in a few weeks. Previously I have asked to leave early because I have a dance class but they didn t let me because it wasn t a good enough... show more I am going to rehearsals every Monday from straight after school to 5pm for a hs play. But also on a Monday I have a dance class that I am currently training for an exam that is in a few weeks. Previously I have asked to leave early because I have a dance class but they didn t let me because it wasn t a good enough excuse?? I know that I should of looked at the times the rehearsals were until before I signed up, but in previous years I have felt left out as the drama department always has such a close bond and I wanted to be a part of that. So what s a better reason to leave early?
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