yea man i wouldnt skip it! these days they tend to put questions and info in passage meant to through you off...like in test 8....the passage entirely speaks of intensity, and in the question tehy ask you to apply I and somethign else...nowhere do u find I in the passage but hidden in the diagram...i got confused thinking it was intensity and scrwed up!
I know that makes it look like reading passage is bad...but im just saying that the info can be anywhere, even in the passage itself, skipping it, or skimming may make u miss important stuff that would otherwise make the question easy...then you'll waste a lot of time and/or get it wrong. so read it, but read it fast....instead of trying to understand it, just read for whats there so that during any question you will b able to think, oh yea its asking for such and such in the passage. and remember to read all the equations in the passage ....just because a quetion doesnt ask you to solve math questions doesnt mean you wont need to know the equation in the passage...for example, a question might ask relationship between length and frequency and you would only know that from teh equation in teh passage...etc.