Hi,
Thanks for your question. You are definitely not alone in struggling to complete the RC section, but - luckily - there is a strategy that can help you out. From a previous post, I recall that you're enrolled in one of our Full-Length classes (is this correct?). If so, you will soon be delving into the VIEWSTAMP method for breaking the passages down, which emphasizes active engagement with the text, focusing on central ideas and themes that you are likely to be asked about (main point, view points, etc.), notating efficiently, etc. Take the RC portion of the course seriously, and make sure to complete ALL of your homework. At this point, I wouldn't even worry about timing - your pace will improve naturally as you develop the ability to recognize and comprehend the relevant information presented in each passage.
A great article on how to approach the RC section strategically can be found here:
http://powerscore.com/lsat/help/rc_strategy.cfm
Another great way to improve is to read as much as possible! And when we say “read,” we aren’t talking about reading fashion magazines, sports digests, or romance novels. Since the Reading Comprehension section often asks you to look at multiple viewpoints and the logical structure behind the passage, you should look for articles that are written in a laymen’s style but take positions or discuss complex ideas. The more you read ahead of time, the more comfortable you will be when you start doing actual LSAT Reading Comprehension passages. If I were you, I'd make sure to read the Editorial or Opinion pages of at least one major US daily newspaper, such as The New York Times, the Washington Post, or the LA Times. Depending on your preferences (or political persuasion), you should also follow at least one weekly or monthly publication such as The New Republic, The Atlantic Monthly, or The Economist. It's also a good idea to read regularly scientific publications such as Scientific American or Nature, given that one of the four passages will be science-oriented.
By familiarizing yourself with the topics frequently discussed in such magazines, you improve your chance of coming across similar topics on the RC. Prior exposure to a given topic invariably heightens interest in that topic, which you can use to your advantage. In fact, a number of research studies show that test-takers who report a high level of interest in the topic of a passage also demonstrate higher levels of engagement with the text. The presence of interest improves reading comprehension by facilitating the processes that support comprehension, such as word decoding, lexical access, syntactic processing, inference generation, self-explanation and summarization.
While your pace is of secondary importance at this point ("rushing" to complete the passages clearly does not help, as you've discovered yourself), check out the links below. You may find some of the strategies quite useful when doing timed sections, though bear in mind that the surest way to improve on the LSAT is improving your accuracy, not speed. This is a test of reading
comprehension, not reading alone.
http://powerscore.com/lsat/help/rc_time.cfm
http://powerscore.com/lsat/help/rc_mind.cfm
As long as you work on it daily, your performance in Reading Comprehension
will improve. Just don't slack on it: I tell my students to do at least one RC passage in the morning, and at least one RC passage in the evening (both untimed) every single day (that's in addition to any other homework, tests, etc. you are doing that day).
Good luck!