2 Month mark – Study plan/Strategy

First, based on these scores, scoring above 600 is definitely attainable. One thing to keep in mind is that none of the test prep companies know the actual algorithm for the GMAT, so you should expect some sort of variance between these exams and your actual GMAT.

In terms of doing CATs, make sure you do every one with AWA and IR. Even though you only need a 600, test day stamina is critical. Unless you are just going to sit there and not answer the AWA and IR sections on test day, you should at least be practicing them when you take each CAT. It's good that you are going to start taking them at the same time as your actual exam, but just make sure you make it as realistic as possible (only 8 minute breaks, no cell phone).

You mentioned purchasing other CATs (which doesn't seem like it is necessary), but have you done the GMATPrep ones? These are going to be the most accurate since they are from GMAC. I would definitely do the two free ones that they give you with the software, and personally I would purchase Exam Pack 1 (which gives you two additional exams). The GMAC official resources are the best thing to study from. If you haven't already, you should complete all of the GMATPrep questions and look into purchasing question pack 1 as well.

In terms of improving, I would make sure to keep some sort of error log. After each set of questions you do (especially after each CAT), make sure to go over every single question and identify why you got it right or wrong and what the traps were. At a certain point, you want to be able to think like the testmakers and identify what their tricks are for each question. You need to identify your weaknesses and do everything you can to get stronger in that area (note: be as specific as possible when identifying your weaknesses, ex. Critical reasoning --> assumptions)

Based on some of your other posts, its clear that you had a lot of test anxiety going into your previous exam. I think it is important to put the exam in perspective. This exam will NOT determine the rest of your life and it is not a reflection of you as a person. Assuming you are taking the exam at the same place as your first exam, you already have a leg up on the competition. You know the entire routine of signing in, how the breaks work, the layout of the test center, etc... All of this familiarity should make you feel more at ease.

In my exam debrief (link in signature), I listed a few things that helped me get in the right mental state for this exam. I personally believe that people tend to wrongfully underestimate the mental aspect of this exam. Throughout the entire process (especially the last week leading up to your exam), you must keep a positive attitude. It's not easy to do, but it will pay off in the end.