Reading Comprehension

Hi

I know that level of difficulty increases with each question correctly answered. Does that hold true for questions with in a speific RC passage too? Or all questions of any RC passage are of same difficulty level.

I took GMAT last in 2004 and now registering again. I had scored 700 then with a score of just 34 in Verbal section. I had run short of time and had guessed last 7 questions. How much could this have affected by my score? As I remember the problem I faced, CR questions were long as also the answer choices.

Thanks a ton!