As you said that you have found a difficult exam in PTE real test. It has happened because you have not done the practice perfectly. So far, I would suggest to use the online PTE practice platform such as PTE GURUS and get the same exam pattern as the real PTE exam. This is one of the best platforms which gives you one test free so that users can optimize their English level.
I have also given the real PTE exam after practicing the Mock test from the PTE GURUS website and got an 80+ score in my PTE exam. That's' why I am suggesting this website