It’s hard to finish LSAT sections in time, and for many people Reading Comp is the toughest section to get through. You have to read the passages, which can take a while, and then if you’re not sure what you’re doing on the questions you can easily end up reading whole chunks of the passage again and then the time just slips and before you know it it’s the five minute warning and how many questions are left? Oh crap, and you start to try to go faster but nothing makes sense anymore and then they call time.
When it comes to the Reading Comprehension section on the LSAT, my eternal refrain is that the best success is achieved by focusing primarily on the structure of a passage, with the content of the passage as a secondary concern. (In fact, I’m working on boiling that phrase down for use as a catchy statement on my tombstone.)