GMAT Strategy

Although I am not an Engg. student, but I had very detailed math courses until high school. But when I started practicing for the GMAT I found that I'm lacking in concepts, and taking more than required time to solve for the questions. It's been 10 days since I have started studying, but I feel deeply unmotivated because of my poor quantitative skills.

As for the verbal practice, it's not a wonder that I am lacking in the verbal section too since I am a non native english speaker! I am pointing out some of my major lacking in both Quant. and Verbal sections-

Problems in PS & DS Section:
1. Algebra applied problem
2. Arithmetic applied problem
3. Integers
4. Rate, time, distance problem


Problems in RC, CR & SC Section:
1. RC- lack of patience to read the whole passage & need to go through the passage over and over again.
2. CR- face difficulty in making inferences, conclusions etc
3. SC- somewhat okay with this section, but still need to improve.


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Now at this point, I really am confused from where should I start studying? How can I overcome my difficulties and lastly, how much should I target to score a safe 600+?
My exam date: Nov. 27 2008


Thanks
=Rabab