Your space ... "My space !"
Where you're sitting is YOUR seat. YOU are in charge of the controls, and therefore the car's destination … if not its destiny.
It's YOUR space. Not mine. Not the examiner's. Yours.
While you're doing your driving test, that's how to think of it. Like your own little room, into which you've invited a guest. You don't have to say "Make yourself at home". You don't have to be a nice host. This is your machinery, your time, your space.
So personalise it. Bring music. Bring fragrances. Hang dangly things that remind you of home. After all, that's what you'll do in your own car. You may even give it a name. It's all about feeling comfortable. That way, you'll be confident to trust your judgments on the move.