The test is adaptive and unpredictable. There is no way you will know or anyone who tells you can tell you how it will go. Some people said the test was easy and they got 555 Others said it was super hard and they got a 725. The test knows and predicts your answer ahead of time. It knows you will fail the 805 question but that’s all it has to give you and if you fail it, it will not penalize it because it knows you will fail it. The score should not be impacted by the difficulty of the questions but rather by your performance. But do prepare yourself to face questions you will not know how to answer. And also, if you are scoring 555 on the test, do not expect to walk out with a 605 - that’s wishful thinking. What you are getting on teh GMAT prep is usually the max score you can expect on the test day, so don’t waste money on attempts if you are not close.