I will suggest of doing 1000 SC as well. Respected mates say it is not worth....but believe me it is. I improved a lot. Hope you will also.

When you said you had "a bit of a handle on it"--did you understand the concepts, but had a hard time using them in practice on the OG, or have a hard time grasping the concepts in the strategy guides?

Also, what's the process that you've been using to review? For students who are really hardworking and used to achieving (and it sounds as though you may fall into this category), a tendency I've noticed is burning through a lot of material very rapidly, and not taking the time to process concepts deeply so they stick. It may be better to use 10 minutes to review the rules applied to one question and practice identifying the various splits (not just he ones that determined the correct answer in the end), than to do 5 questions and read the answers. While you're doing OG questions, of course, timing is key, but the review process should be deep and even more active.

It's totally normal to notice a dip in the thing you haven't looked at in a while, so don't feel bad-- you're doing the right thing by going back to review, and I think you were actually right to tackle your biggest weakness early on, too. But as you move toward the test date, try to build in some "cross-training" days along with your subject-intensive review (mixed random drills across all question types). You don't want to lose the edge on your strengths as you brush up your weaknesses! When you come up against the actual test, it will involve rapidly switching gears between question types, and that's a process skill that only develops with practice too.
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JP Park | Manhattan GMAT Instructor | Los Angeles

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