Hi schelljo.
Working on SC sounds like a good idea. Beyond, that it's a little challenging to evaluate your plan without some more information.
Having said that, I can say that I wonder if you are being too general in your approach to increasing your quant score. It seems that via using your past CATs you could determine what areas of quant you need to work on most to achieve a higher score. If some of them stand out more than others, which likely is the case, then maybe a more targeted approach would make more sense than the general approach to quant which you have described.
Also, your approach sounds a little book heavy, as if you are studying for a math test or an English test rather than honing your skills at playing a reasoning game, which is basically what the GMAT is. So maybe you should supplement your reading with more game playing, by using a question bank such as the quant questions offered on Bellcurves.com, the question bank offered by Veritas, or the questions offered by Magoosh.
Also, along those same lines, probably you should be using practice tests more often than once every six weeks, both in order to get practice at playing the game that you are seeking to learn to play, and as a means of assessing where to focus your preparation. In addition to the GMAT Prep tests, there are decent practice tests offered by certain companies, such as Veritas and MGMAT.
Even if you want to focus mostly on SC at this point, you could be using question banks and practice tests to continue regularly practicing CR and RC and figuring out how to getting more points in those categories too. If you can already do pretty well with CR and RC, maybe you can get to the point of doing extremely well with them and get a high verbal section score.
Maybe that will help.
Still, I am curious what quant and verbal sub scores you achieved on your recent practice test. Maybe if you provide that information, I, and others, could give you some more ideas.
