What's the meaning of the idiom " Get (one's ) Act Together"?

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What's the meaning of the idiom "Get (One's ) Act Together"?

Did you clearly hear what he said ?
He said ,"My dad's right. I do need to get my act together. In Hollywood...."


get (one's) act together - to organize one's activities so that  things will be done in an effective way. 


Example sentence:
 If Mae would get her act together, she'll get a better job. 




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