It is very unusual to improve by 200+ points in 4 weeks, yes. I'll never say that anything is impossible, but most people would not be able to improve that amount in that length of time.
the problem is I am done with my materials and I have just got the practice tests.
You may have gone through your materials already, but you are not done with them if you do not yet have the score that you want. You haven't learned what you needed to learn from them.
By the way I have no issues with the timing
I have met maybe 10 people in 15 years who truly had no timing issues. I have worked with thousands of students. Maybe you really are one of the very few without timing problems... but you're going to have to prove it to me. :) Simply finishing the test on time does not mean that you have no timing problems - you can have quite severe timing problems and still finish the test on time.
Use this article to analyze your most recent CAT:
http://www.manhattangmat.com/blog/index ... ice-tests/Then come back here to tell us what you've discovered. (Note: please do not simply post all of the data. Tell us your analysis - what you think the data means. It's important to be able to do this kind of analysis for yourself.)
So I just want to know how many more CAT codes should I take before the real GMAT.
CAT exams are really good for (a) figuring out where you're scoring right now, (b) practicing stamina, and (c) analyzing your strengths and weaknesses. The actual act of just taking the exam is NOT so useful for improving. It's what you do with the test results / between tests that helps you to improve.
So how many more CATs should you take? First, there's no standard answer to that question and, second, that question is mostly irrelevant to the goal of trying to improve your score. :)
How many questions should I get right in quant & Verbal section in order to get a 600+ score ??
For any score from about 35% percentile to 80th percentile or so, you will answer about 60% of the questions correctly. The test is not scored based upon percentage correct.
From the questions that you ask, I can tell that you don't know enough yet about how the test is constructed and scored. That would make it very difficult to set up a study plan for yourself. So, first, read our e-book The GMAT Uncovered and pay particular attention to the Scoring section. Also read this article:
http://www.manhattangmat.com/blog/index ... to-win-it/Next, you can use this article to develop a study plan for yourself and you can share that plan with us and ask us what we think. Note, though, that you'll need to give us data on your strengths and weaknesses in order for us to evaluate your study plan - use that article I linked above for analyzing your practice tests.
http://www.manhattangmat.com/blog/index ... tudy-plan/You may also want to read the below; it contains many of the same links as the previous article, but it also contains some different links:
http://www.manhattangmat.com/blog/index ... -the-gmat/