Here in the UK, you can make mistakes on the driving test and still pass the DSA practical car assessment (I was told you can't make mistakes in the Netherlands, which is part of the EU).
The DSA driving examiner does not expect you to be a perfect driver, and you are allowed up 15 driving errors on the test (as long as they are not classified as serious or dangerous), with each mistake marked on the DL25 test report sheet underneath the appropriate section as the assessment takes place. I've already mentioned before that you should not take note of the driving examiner's marking, but it is important also that you don't giveup hope while on the driving test, no matter the mistake you make during the 40 minutes that the examiner is in the car with you.
The most sensible thing you can do if you make a mistake during the driving test is correct it if possible, so if you wanted to select a particular gear to go up a hill, don't allow the car to struggle all the way up if you accidentally got the wrong gear. The examiner might not mark you down if you make the correction immediately, but you would definately get a driver error if you allow the car to continue in the wrong gear.
The other thing to bear in mind is that the driving test is not over until you get back in to the test centre and the examiner tells you to turn off the car engine, therefore you don't know that you have passed or failed especially if you made a mistake which your instructor has told you not to do on the test (touch the kerb during turn in the road). The DSA examiner does have some discretion to use, and while you want to drive at the required standard, you must not give up hope on any mistakes you make, as you could still pass the driving test if the examiner decides to be lenient on you.
Important! If you are not learning to drive with an instructor, it is important that BOTH you and the person teaching you to drive read The DSA official test guide, this book will greatly increase your chance of passing the driving test without spending too much money on lessons.
See also reasons for failing driving test and driving test guarantees.
Road Signs and Markings on the Driving Test
Junctions on the Test
Turn in the Road 3 Point Turn