Plating dilemma

You might try a Zen circle, which is done freehand and can be much less precise. I do this often with melted chocolate to decorate dessert plates. No turntable required.

https://www.modernzen.org/enso/

Just wondering, what other plating ideas did you have, that might be easier to execute and/or control to your satisfaction?....

I suppose you could improvise a turntable somehow... If you can bring one in to the exam, I've found them before at thrift stores. Also, microwaves usually have a little ring of removable wheels under their plates that you could pull out and use then replace when finished. It's not perfect, but would work. Those are my first few ideas.