Parking is a skill and to obtain a skill, you need to do it over and over again till you have perfected it. Everyone knows that acquiring a skill is not impossible, but it needs your utmost dedication if you want to succeed.
In this game, you can't do it over and over again as this is a exam for a driver's license. Once you failed then you can say goodbye to your license. The examiner will give you some instructions and you need to listen carefully. You are only given two chances, so make sure that you listen to the instruction well.