It’s a quarter to 12 (Official clock system).

11:45

It’s a quarter to 12.

Correct answer

12:15

It’s a quarter past 12.

Error: mirror minute hand about the vertical axis

11:51

It’s 9 to 12.

Error: read minutes as hours with ‘past’ or ‘to’

09:45

It’s a quarter to 10.

Error: quarter to 10