I agree with @jdawg. I usually circle a couple words that make the question incorrect or if I'm really struggling between two answers I'll write out a short sentence as to why I think it's right/wrong.
What I do is always underline a sentence or circle a word that threw me off in the answer choices and made me not pick them. That way during blind review step 2 I know exactly why I didn't pick some answers and can tell if I made a mistake or not
Law schools care about their rankings, which are largely affected by the numbers, more than students do. They absolutely care more about a 175 than a 170.
Oh I like the number thing! The letters is good too, but for some reason the numbers will be easier for me, but then again logic games are easier for me than LR
I recommend Moonwalking with Einstein by Joshua Foer and A Mind for Numbers by Barbara Oakley. These books helped me better understand how people learn and how memory works.