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mamba5
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okay
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You're off to a good start! The Manhattan guidebooks and the OG form a very solid study combination, so I don't think that you will require additional books. And Waiting until January is probably too long and counterproductive. With so much time, you might become passive about your studies or suffer from burnout later on. Be on guard for those risks. Perhaps you're a little apprehensive about committing to a test date at the moment. If so, then don't worry about that now. Wait a month or two and see how you're performing. Determine a test date based on that.

As for Sackmann's math sets, I strongly recommend them. Your math ability seems fairly solid, so maybe you can skip his Fundamental sets and go straight for the Challenge and Extreme Challenge sets. Toward the end of your math studies, look into the GMATClub Tests. Save the those until later when there's less stuff to cover, as they will consume most of your study time and energy.

I also found that practicing Sackmann's sets and the OG alongside the Manhattan guides produced the best results (for me, at least).
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