Andrekya/Anju et all,
I wrote the test in October, scoring 640(48, 29, 6), retaking it in Feb, so I guess I can answer your queries:
ANJU:
1). First 5-10 questions count more in the sense that they are the ones which determine your score range, so assuming you answer first 5 questions correctly, the order of questions would go higher in difficulty and you would get more challenging questions , till you incorrect and so on. So by 10th-15th question your score range is already determined, what you get from 15 onwards would be questions of less difficulty. HOWEVER, if you plan a stretegy of correcting only first 20 questions, and leaving/just skimming through the rest, then your score will again go down drastically. The catch is that there is HEAVY penalty for leaving questions unasnswered and moreoever your answering all questions incorrectly after lets say 2oth question would again let you down. Ideal strategy followed is to devote some more time to first lets say 10 questions and then progress faster.
ADREYKA:
The QUANTITATIVE section is harder than it is in the Official guide. I followed Kaplan, Official guide,PR. The first 5-10 questions you get are harder than found in any of the above books. However if you mess up in first 5, you would not know that you get more diifcult questions then above books.
GUEST:
3). If your Criteria is to get scholarship, then most of it is influenced by your gmat and academics. But do not expect this from atleast top 10-15 ranked schools. There you would be eligible for a loan with the help of a co-signer. Assuming you get a score of 720-740, you can get schol.. at Rochester(Simon), Washington(olin) et cetera. BUT your chances getting a job post mba would be very less, as almost all companies ask for an experience of 4 year plus. I suggest you work for 1-2 years more and then apply.