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The decision day has come, I need to stimulate myself to get up early, become an early-riser, go to bed also early :) and spend the morning time studying for GMAT.
What are my current results?
Took Quantitative section in Powerprep recently, scored 47.
In Kaplan diagnostic, got to 650 total
In Princeton, a week before Kaplan - 640 total, gaining something like 48Q, 38V.

Having analyzed both results, can say my favourite: "Man, there is still room for improvement".
Current success in the areas are (from weakest to strongest):
avg.err.RC - 38%
avg.err.SC - 34%
avg.err.CR - 27%
avg.err.PS - 15%
avg.err.DS - 13%

avg.err.Overall.Math 14%
avg.err.Overall.Verbal 30%

Verbal has much to do with it.
First of all, have to improve my Reading Comprehension. After having read various sources, found a way for it:
1. do not subvocalize while reading and due to it increase the speed of reading.
Funny, but used the special on-line read speed checker that showed the result 328 wpm and more than 90% comprehension.

I'm stuck in reading more with scientifical passages, especially biology. There are nice resources for improving it - Scientific American :) it has so many nice things about biology to read about.

Another weak are - Sentence Correction seems to be improving after certain number of questions.