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Okay, first, nice job on the 690! I need a lot more detail from you, though, before I can know how to advise you.
Use the below to analyze your most recent MGMAT CAT(s):
http://www.manhattangmat.com/blog/index ... ice-tests/Then come back here and tell us the results of your analysis and what you think you should do based on that analysis. We'll tell you whether we agree and advise you further. (Note: do share an analysis with us, not just the raw data. Part of getting better is developing your ability to analyze your results - figure out what they mean and what you think you should do about them!)
Good that you're going to use Advanced Quant. You may or may not need OG13 - it only has about 200 new questions in it (compared to OG12). It does, though, give you access to 50 IR questions (OG12 has zero), so you may want to get it for that reason.
For RC, are you struggling with the reading side of things? The questions? Both?
I'll start you with some reading resources, but (after you do your test analysis) give me a better idea of what's giving you the most trouble.
http://www.manhattangmat.com/blog/index ... p-passage/http://www.manhattangmat.com/blog/index ... -passages/http://www.manhattangmat.com/blog/index ... -passages/Also, check our blog over the next week - I just submitted another RC reading article; it should go live soon.