Correct that the beta questions don't count. But not all questions are worth the same number of points, so correctly answering 70% of 75 questions is not an accurate way to look at it.
That said, you are focusing on the wrong thing. While taking the exam, it is a distraction to try and guess your score. You do not have enough information to calculate it, so don't waste any effort estimating.
During the exam, there are three things under your control:
- reading the question and each answer carefully, so you don't make "stupid" mistakes.
- selecting the "best" (or "least bad") answer from the provided choices.
- not running out of time.
All of your focus needs to be on these three things (and especially the first two). Everything else should be ignored. The goal is to remain fully in the "question answering zone".
#3 needs a bit of preparation so you can "mostly ignore" it. Use your practice exams to make the requisite pacing instinctual. While taking each practice exam, run a stopwatch (face down) and when you are done, calculate how much time you spent per question. Then on the next practice test, speed up or slow down a get to get closer to that magical 1 minute per question pace. After a while, you will find that you are running at a minute per question without even thinking about it, leaving your mind free to focus on #1 and #2,
If by exam time, you haven't quite reached a comfort level with your pacing, do a time-check every 20-25 questions, but don't do it any more frequently because #1 and #2 are so much more important and they are the ones where you want to focus your attention.
