It’s 23 to 3 (Official clock system).

02:37

It’s 23 to 3.

Correct answer

02:36

It’s 24 to 3.

Error: 1 minute earlier

01:51

It’s 9 to 2.

Error: read minutes starting from hour markings and adding minutes

07:10

It’s 10 past 7.

Error: confuse hour and minute hands