informal.to organize yourself and your activities in a more effective way in order to achieve something.
这是一个非正式用法.意思是:把自己和自己的行为以一种更加有效的方式组织起来,以便做成某事.也就是仔细筹划、安排的意思.(这是按照字面翻译,其实这种结构,你可以用句子来解释.比如:He needs to get his act together if he's going to pass.他想过关(考试或者别的),还得再加把劲/还得再计划计划.)
不过,你最好把上下文给列出来,这样可以准确一点.