Why Highly Developed Driving Skills Are Necessary
The test proves you can drive without doing anything that would get a normal driver killed. That's the floor. It is not the ceiling, and the drivers who mistake it for the ceiling are the ones you have to watch out for on the road for the next forty years.
There are two kinds of learner. The one who thinks the test is the finish line, and the one who thinks it's the start. The first passes and forgets everything by Christmas. The second keeps building, and becomes the driver you actually want to share a wet road with. The difference isn't talent. It's whether they kept paying attention after the certificate arrived.

Real skill is anticipation
Car control, working the pedals and the wheel, is the easy part. It comes in within the first several lessons, in order, one control at a time. The skill that actually keeps you alive is reading the road far enough ahead that you're never surprised. Seeing the ball before the child. Reading the brake lights three cars up. Clocking the side road where the car's going to pull out before it does. Good drivers look like they have all the time in the world because they saw it coming and bought themselves the time.
Newly qualified drivers are badly over-represented in the worst crashes, which is exactly why the N-plate, the lower alcohol limit and the tighter penalty-point threshold exist for them. That's not the RSA being mean. That's the RSA reading grim numbers and writing a rule that fits them. Building real skill in those first two years is how you stay out of the statistic.
The habits that separate them
Checking a mirror because you want the information, not because the routine told you to. Leaving a gap you'd be glad of if the car in front stopped dead. Adjusting to the weather, the light and the road instead of driving the same at all times. None of it is dramatic. All of it is the quiet difference between a driver who copes when it goes wrong and one who's a passenger to their own bad luck.
Keep learning after the test
The certificate is a licence to keep learning, not a certificate that you're finished. The best thing you can do in your first couple of years is treat every drive as practice, and get proper input when you know you're weak. That's the whole case for structured tuition being worth the money and for understanding what the learner and new-driver rules are actually protecting you from. You're closer than you think. Now do the roundabout again.