Meaning for 三日後に　本気出せ


From what I understand, it means "Do your best three days after the fact"? But
it doesn't make much sense in English

Here is the line that precedes, if it is any help:

> テストも授業も却下可能  
>  三日後に 本気出せ




Where did "after the fact" come from? 三日後に just means "three days later", and
三日後に本気出せ means "Get serious three days later", which implies "It's not time to
get serious now, worry later".




Where did "after the fact" come from? 三日後に just means "three days later", and
三日後に本気出せ means "Get serious three days later", which implies "It's not time to
get serious now, worry later".

