Seriously?! So the first time you are allowed to drive a car, even with a licensed driver supervising, is on the day of your test? That doesn't sound right to me.
You can't drive a car here without a license, but you can get a temporary license so that you can drive with another licensed driver over a certain age.
Yeah that's it! There is only one chance for you! There are adac-exercise-places. With a little luck you have one of them near to your town and then you can practise there. Only condition you have to be at least 16 years old and your father and mother has to sit next to you. That's a problem for some people becasue you can start to make your driver-lizense with 15 3/4 years if you want to and if you have no parents with a lizence it's difficult too!
And these places are so small. There not really good to practise! Just about 200-300 meters for you to drive!