Why "prêts", and not "prêt"? "On", the subject of the sentence is singular. Should not the adjective also be singular?
Dictation exercise C1
The text says -
"... qu'on soit prêts ou pas, notre vie ..."
Since it refers to several people, on counts as a plural and the -s is added.
Take a look at the following Kwiziq lesson to refresh your memory -
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