My reading speed is about 225-240 wpm. But I have to read the passage at least twice to answer questions accurately. I can't finish verbal section without leaving 1-2 passages unanswered (I mean randomly answered).
basically it is not reading speed but staying foucused. Reading once is all I could do. Instead I tried to read attentivel and stop. I even took notes that I never referred to later, but I still took them because I remembered more this way. (I am talking about RC only).
reading twice has some disadvantages:
It is illustrated by the following analogy, which fails fairly soon, but i think is quite good:
Would you rather be married twice to two average women, or once to a good one?
This is what I mean - reading well once is better than skimming twice since you probably skim the same parts.
My problem was actually my mind lagging behind my reading speed - I could not absorb information fast enough to be able to answer questions accurately. THat's why I would stop after each paragraph and sum up what was said and what was going on. I would try to understand processes if any were mentioned or would immediately try to compare/contrast the ideas rather than waiting for the question to ask me do it.
What tests are you practicing with? You have mentioned that you ahve to guess a number of questions.
P.S. Reading can take as much time as you have. If you had 4 hours to spare for reading, you could probably invest all of it into reading and never be exactly sure in your answer. So, I suggest that you answer CR and SC carefully but not wastefully, taking 1 minute for SC, 1:30 for CR, and the rest of time - 32 minutes for reading. This would give you roughly 8 minutes a passage with questions. 5-6 mins per passage and 30 sec/question. Sounds reasonable?