Doing test in mothers car instead of instructors car?

Hi guys. I’m currently driving around with my mother on L plates in my mother’s automatic Audi Q5 2.0 litre. Once a week I have driving lessons in my instructors automatic VW Polo 1.0 litre. Absolutely hate driving the Polo. Doesn’t smoothly take off like the way my mother’s Audi Q5 does and not comfortable to drive. Should I take the future lessons in my mother’s Q5 and should I do my test in the Q5 taking into account I’ll have the reverse around the corner and the turnabout to do during the test.