Hello,

Wow. That's a lot of practice tests. So I have to quick points to make.

First- doing tons of tests and problems is great, but at your level you really need to work on your weak areas. If you haven't already go back over all of the tests and really find out what your weak points are. Then review these areas (with the Manhattan guides or what ever you used to study the concepts and previous problems that are related). Next, do new questions that that cover these areas (perhaps out of the OG supplements if you haven't exhausted them).

Secondly- and this is more of a question I suppose, but how many times have you done the GMATPREP tests? If you haven't done each test at least twice (for a total of four tests) you should do them again because you'll continue to get new questions. Even if you have done the tests twice each you can still do them again and get new questions (but the score will obviously be inflated)

Cheers!

Beyond, the OG's I'm not too sure what you should go over for the CR. However, working on the RC should help you with the CR section as well. You could try the Critical reasoning bible, but I haven't read it myself (I had a good score on this section from the beginning so I didn't work on it much).

As for how to approach the CR section I think you shouldn't follow what most books teach (at least for the first step). Here is what I think you should do

1) scan the question and look for a few keywords like strengthen, weaken, conclusion, assumption. Don't spend more than 5 seconds reading the question. Since you haven't read the passage yet it is difficult to make sense of the question so you should only scan it to get an idea of what it is about.

2) read the passage

3) now really read the question

4) Try to answer the question before looking at the answer choices! This is a very important step that many people skip and will really help you not fall into the GMAT traps

5) go through the answer choices.

Cheers!