when i was studying I found that the Kaplan reading was very hard. much harder than the real thing. I didn't use the techniques that they suggested where you outline the whole passage and refer back during the test. What I did was go straight to the questions and hunt for the answers that way. the passage was still up when I was reading the questions so you don't have to worry about going back and forth. doing that also helps because while you are hunting for the question you are on you will also find the answers for other questions you will get later in the section. But I can't stress enough that the real thing (just talking about the reading comp) was much easier than any thank Kaplan will give you. doing that got me a 380 on the reading comp but my Kaplan scores were in the 300-320.
Also if you go over a section and cant find the answer mark it and move on. Either you will find it when searching for another question or you can guess at the end.
One final thing, if you finish a section early and have a few min left get up and walk around, stretch or do something to help you relax. it may make the test take a little bit longer but it will help you in the end to stay focused and alert.
Good luck