The two strategies that helped me improve my RC were following a very prescribed strategy from Kaplan, which is very similar to Manhattan. When I say following, I mean really religiously following every single step such as creating notes, pausing, and other steps no matter how illogical they may have seemed.
Second aspect that helped me was reading books. Classic fiction, it had longer sentences, and and more complexity than most of the newspaper reading. I would spend several hours a day reading books, and enjoying it while add it.
Finally not directly related, but I was able to optimize my timing by reducing the amount of time I spent on SC and CR. That allowed me to get seven or eight minutes to spend on each of the RC passages
With the amount of time you have left, you probably only have time to polish your strategy. Make sure you do have a strategy and that is a realistic one and it's not going to fall apart once you're at the test center. Otherwise you just wasting time for nothing if you're going to abandon it.
PS if nothing else works you can try a crazy idea someone discovered on the forum. I don't know if it actually works on the real GMAT but someone noticed that if they skip an entire RC, I believe the third one they still got a very decent verbal score and save themselves a bunch of time. I would not use it unless you had a use for entire Time this would save you or unless I had no other options. This is an unverified Theory and likely not a reliable one.
Hope this helps.
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