It’s 6 to 8 (Alternative clock system).

19:54

It’s 6 to 8.

Correct answer

19:55

It’s 5 to 8.

Error: 1 minute later

18:50

It’s 10 to 7.

Error: read minutes starting from hour markings and adding minutes

23:35

It’s 25 to 12.

Error: confuse hour and minute hands