Probably that's just who they have doing the transaction (for GMAT Write).
For language variation, try things like "The author claims / argues, states / asserts" in addition to "The argument / passage says / states." :)
Are you still trying to improve at this point, or are you just reviewing and solidifying? Improvement doesn't come from taking a bunch of tests. 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.
Generally speaking, we try to improve up until about 10 to 14 days before the real test, and then we switch to reviewing and gearing up for the big day.
Re: the "must memorize" things, I assume you're referring to facts, rules, etc. How did you memorize those kinds of things in school? I like flashcards, because you can then use them to keep quizzing yourself.
Also, I just want to make sure: you aren't trying to memorize all the different solution methods for all the problems that you study - that would take forever. Instead, you're trying to learn how to think your way through any problem in general (with the understanding that sometimes you'll get problems you can't do, and your goal there is to recognize that before too much time has passed, so that you can guess and move on).
If possible, take your last practice test exactly 1 week before at the same time of day (and make sure to take it under 100% official conditions). If you can't do it that exact day, do it about 5 to 8 days before (but not closer to the real test than 5 days).
And use these for the last 2 weeks (can be compressed to 10 days if needed):
http://www.manhattangmat.com/blog/index ... game-plan/
http://www.manhattangmat.com/blog/index ... game-plan/