I too agree with Nurse2pilot. If you aren't satisfied talk with him and sort things out. My PPL instructor always made sure I was cool with him. He always shouted at me in the flight and in the debrief when I didn't come prepared or didn't do properly but later I realised that it was to save my money and make me a better pilot and after all that he didn't have any grudges with me and neither did I. And if you aren't prepared don't go for it. That is just a waste of time and money.