As per merriam-webster "tick off" could mean "to make angry" or "reprimand". However, it seems to have another meaning in a tutorial.
There are 2 guys showing the IELTS speaking test, the women is role-playing the examiner and gives the following comments to the guy role-playing the candidate.
the examiner is ticking off, very nice linking word, very nice intonation, Oh past perfect continuous ... you're doing OK.
What is the meaning of "tick off" there?