these two tests you took -- were they recent tests (i.e. from 2003 - 2006?) or test from a while back (i.e. 1995-1998?). the best advice i can give to people about RC is that where the older tests were basically rote "what did the author say in the passage/what did the author say this for in the passage" questions, the more recent tests have questions that are a lot more difficult because they ask you to delve much, much deeper into precisely what the passage means and, on top of that, the answer choices are often very difficult to tell apart from one another. very frequently, you'll have 3-4 answer choices that are very appealing but it turns out that 3 of those answer choices are wrong because they have a slight word or phrase that is different from the meaning of the passage, thereby making them wrong. just keep practicing, making sure to get as firm a grasp on precisely what the passage is saying before getting into the questions.