How can I improve and get the last couple points? (SAT)

I have been getting between 2280 and 2360 on (official) practice tests (750-800 on all three parts) but I can’t seem to score well on all three consistently, making my scores go up and down. There’s always a couple questions that trip me up. I have gotten 800 at least once on every section so I don’t think my skill is lacking, but I don’t know how to make the last leap to actually getting perfect scores. My main problem is critical reading. I know that every question has one unambiguously correct answer, but there’s always 2 or 3 that I can’t decide between. Writing is mostly ok, and I’m confident that I can get a perfect score with a little more grammar review. Math is my best subject in school (AP calc last year) so that’s not really a problem either (but occasionally I miss 1 here and there, just more practice needed, I think). So essentially, how can I get those last 30-40 points in each section, especially critical reading? Thanks.