Let me rephrase: you want to score as well as you can, but fixating on 90 vs 80 isn’t going to help. Look at how we (generally) study for our writtens other than private now: via something that, while not rote memorization, is awfully close. Those of us that choose to read the explanations of answers given in Sheppard are going to learn the material, but doing that isn’t required or even recommended by them.
Should we go back and review the topics pointed out by the learning codes? Absolutely! Should we expect the DPE to dig in deeper on those topics? Absolutely! Should we TRY to do our best? Absolutely! But as a gating function, a written test score of 70 is no less passing than a written test of 100.
I spent the better part of a month fretting over how I got in the 80s on my private written. I went back and studied my learning code topics. I was absolutely ready for my oral when the DPE took my written results and went down the list digging in on them. But the point is that the LEARNING CODES are what is important, not the score.