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The plan is to take a test every other day and practice/study the alternate days.
Complete overkill and an extremely inefficient way to try to improve. :)
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.
You didn't tell me what your overall practice test scores are right now but I'm guessing they don't get to the 700 level beause you said that you're trying to "push" yourself to that level still.
As a general rule, wherever you're scoring about 1 to 2 weeks before the test is about where you should expect to score on the real test. If you are almost at 700 already, you may want to go ahead and take it in 2 weeks, hoping for the best but prepared to take it again if needed. If you are far from your goal, you will likely need to postpone (if you don't want to lower your goal score).
It is difficult to significantly improve anything in 2 weeks and, unfortunately, RC is probably the hardest verbal area in which to improve rapidly.
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At this late in the game I am nervous to change my strategy.
So would just practicing improve my score?
You aren't happy with your current score, so you have to change
something or get better at something. I agree that you don't want to be changing major strategies a week or two before the real test, but if you aren't happy with your score, you've got to change... so that leads us back around to postponing your test.
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But my fear is that there aren't enough difficult passages/questions in it.
I see this assumption a lot - people have the mindset that if they just do a lot of hard problems, they'll somehow pick everything up and remember it and then get better / do well on the test. That's possible, but that takes a LONG time; it's a really inefficient way to study.
Rather, your focus needs to be on
learning how to get better - and you can do that using things that you have already used in the past. Then, you use new material to test yourself. But don't just keep plowing through new material and more new material - if you're not learning what you need to learn on each question, you'll take forever and never really get anywhere.
Take a look at these articles for RC; they talk about what to do for various tasks and questions types, but also how to analyze, think about what you're doing, figure out how to get better, etc.:
http://www.manhattangmat.com/blog/index ... p-passage/http://www.beatthegmat.com/mba/2010/07/ ... rc-passageHow to do an RC infer problem AND how to analyze RC problems in general:
http://www.manhattangmat.com/articles/a ... estion.cfmhttp://www.beatthegmat.com/mba/2010/09/ ... prehensionhttp://www.beatthegmat.com/mba/2010/11/ ... il-problemRemember this: 80% of what you learn / how you get better comes from the analysis and review you do AFTER you have finished doing the problem in the first place. :)