Need Tips for Reading Comprehension

I am aiming to consistently score -1 or better for reading comprehension. I am currently getting a large range of scores under timed conditions, anywhere from -0 to -6. Here are a few conclusions that I’ve reached since analyzing the last 80 passages that I’ve done. 1) My average is around a -2.5 at the moment
2) I rarely have trouble with Main Point questions
3) I don’t have have trouble with a particular topic (hard sciences, arts and humanities, law, social science), having analyzed all my scores, I am essentially equally bad/good at the four topics
4) I always manage to just barely finish on time but I never get to double check.

I would really appreciate any advice on ways to improve my score, and any suggestions on how to identify my weaknesses would really be appreciated too.

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If you haven’t done any 50s/60s RCs yet, do so. I know it’s a general rule of thumb to keep the modern stuff as fresh as possible, but it’s really worth your while to take a modern RC section if you haven’t already, as the modern sections are just tougher. This will give an accurate gauge of what you’d get on RC - as it stands - on test-day.

I was hitting a good amount of -2s on ancient sections (7-28). First 60s RC I did? -9, then -8…I’m much better now but it took about a month to really get into the groove of the newer sections.