Usually, it ends up working against you far more than helping. What happens is that you try to focus on those 7 or so questions while reading. By the time you're done reading the passage, you've forgotten most of the questions, not found your answers for the ones you did remember, and, most importantly, you don't have the main idea or author's opinion. Furthermore, reading the questions can color your judgment and/or split your concentration which makes it more difficult to find the main idea. Now if this was simply finding little details here and there, things would be different, However, MCAT verbal is primarily focused on capturing the main idea, not finding details.
That's true, it will help for those questions. However, the pay off of losing focus on the main idea and author's opinion is still too high. Often times, the detail questions can be answered with those two tools. I didn't believe it at first either, but it works.sometimes i think it really pays off for those questions asking to refer to some specific word and its context. it saves me a lot of time to highlight it as i read it, instead of having to double back and find it. what do you guys think?