'They couldn't do it better'
Who is the speaker?
Whom do 'they' refer to here?
What is 'it' being referred to here?

Dear Student,

The speaker is the narrator and ‘they’ refers to Nicola and Jacopo. 'It' refers to the various jobs that the two boys did to earn money.

Hope this information will clear your doubts about topic.
If you have any more doubts just ask here on the forum and our experts will try to help you out as soon as possible.
Regards