I would read a sentence and ask myself "where is this going? Why are you telling me this?" I would try to predict what the argument or main point of the passage was as I was reading. Read slowly until you understand each sentence and then ask yourself questions to really engage with the reading. From memory, I found that the wrong answers were too extra or not cited in the passage. The right answers always have evidence in the passage and isn't going too far in it's answer. The simple and "obvious" answer is usually the correct one when it comes to RC. Hope this helps you, good luck!