Did your instructor give advice on how much road to take at every turn ? I made notes after each run as to when it was acceptable to take a little of the other lane . On test day I had three very tight left turns and the instruction which I had received was perfect for each turning . I was given various markers as to when to turn and memorised them - man hole covers , lines etc . The issue you have is with your trainer , not the examiner . Good luck with your re test