oh gosh this happened while i was studying today on this passage about caffeine and other chemistry scienterrific words!
there are a few different things you can do ...
you can start with the above, looking at the first sentences to get a feel. then, look at the answer choices. eliminate the answer choices that have something you KNOW is not correct in them. for ex, with my passage, i knew it was about a theory on caffeine. so i eliminated the passages that talked about the main idea being a "phenomenon", and the one about it being about "3 theories" .
you could also try quickly going over the passage again and using really basic, kid-speak to summarize each paragraph in one or two sentences. that will help you get a better feel for it.
hope this helps!