What is the importance of schedule?

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I plan my schedule in advance.

>> Correct
I make an appointment at least 1 week ago.

>> Correct
If I make an appointment suddenly, I think I am embarrassed.

>> If I make an appointment suddenly, I get embarrassed.
So I try to plan my schedule in advance.

>> Correct
Also, I plan my next day work a day ago.

>> Correct
So that it is easy to process that day work.

>> So that the work will be easy to process.