I see others are focusing on visualising having passed the test. I think it's important to imagine you've got the driving skills mastered. I'd imagine that You're completely competent, relaxed, focused and in control behind the wheel. Yes master visualising yourself as a natural and being good at the parallel parking and road reading and hazard perception, just practice being good in your mind because having the ability to be able and in control is what it's all about.
I have a warning about the instructor. Mine asked me first if I was a good driver? And I said yes.
He was old school and that was the wrong answer. So he wanted to knock that over confidence out of me and I almost didn't get it. I think he believed no one was a good driver because we must always be humble.
Apparently driving is very........dangerous. And my instructor screamed that I must have no Ego when driving. It's all about driving defensively. Other road users will do wrong things and your job is not to judge and not to react inappropriately because frustration causes accidents.
So if you are asked if you are a good driver, the right answer might be confident you are ready to pass the test but realise your true learning starts after you've got the licence because a person must always try to be careful and safe and learning is an ongoing process. Something like, yes you're ready to be tested and you will always try your best because you're exposed to risk on the road and driving can be dangerous. But to become a safe driver you need the license to gain the experience to avoid accident situations.
There was an old study on the driver and other road users. The study was seeming to go towards a man drives as he lives. That means personal characteristics and emotional attitudes. They looked at the drivers age, sex, whether they were single, married, widowed or divorced. And although there were direct corresponding ratios to inner problems and road collisions. At the end of the report the outcome was it was experience that made a safe driver. So no one is a good driver but to aspire to be a safe driver you need experience at reading the road for hazard perception to avoid potential accident situations.
Just practice in your mind driving as well as on the road.