Ugh. I am sorry. As a tOSU student, the comm OSCEs are incredibly subjective. The best way to go about them is not with authenticity, but with a script. Know how to use the skills verbatim among many different scenarios!
"Hi, my name is Dr. blah blah. Its lovely weather we are having, isn't it?"
"Today, we are going to discuss x, y and z. First, I will start with x"
"What I'm hearing you say is..."
"Tell me more about..."
"I know you mentioned wanting to vaccinate Fluffy. Tell me what you know about vaccines?" "Great, it sounds like you know a lot about vaccinations! Something to consider is x, y, z. What questions do you have?"
"Now that we have finished x, we will talk about y..."
etc.
etc.
etc.
It is formulaic and formulaic only. They are literally checking boxes to see if you used specific skills; some graders are able to parse these out even if you don't use the skills verbatim, others expect a deliberate and clear use.