Hello - I take the GMAT in a little over a month and I am sort of struggling with how to organize time and study material. I've taken three of the Manhattan GMAT CATS scoring 590 (33Q 38V) 600 (39Q 34V) and 690 (43Q 40V). GMAT Prep 1 before the MGMAT CATS was a 590 (can't remember break out). I'm not looking to score a 700 but would like 680ish.

My question is what should I be focusing on during my last month of studies? Among my error log, my notes, OG questions, and Grockit (which I signed up for a few weeks ago to target weak areas), I'm not sure what is most important and what is a must to get through. I would think all the OG questions/books. Most people would say practice CATS to get timing and stamina. Timing was something I addressed from the start and I can honestly say I do not have timing issues. I know when to put in a little extra time and I know when I'm beat. The MGMAT practice CATS usually take me a full two days to review and do give me great insite to weaknesses, but they take that much time away from extra questions on my weaknesses. Same for the GMATPreps but those questions are supposed to be better to review than the OG (book) questions, so I hear. So maybe some of you can help me out and let me know what you think really helped to boost your test scores in the final month or what some of you are targeting in your final month now.
Thanks