Really the only exams to consider if you are taking just a couple more are Manhattan and the Official exams from GMAC. Even though you have already taken the GMAC exams, going over them again is helpful. You can even go through whichever section is troubling you multiple times to get to different questions. While the Manhattan exams are very good, they do over-emphasize some of the more difficult subjects, but they should be helpful too.
GMAT Answers provides a world class adaptive learning platform.
-- Push button course navigation to simplify planning
-- Daily assignments to fit your exam timeline
-- Organized review that is tailored based on your abiility
-- 1,000s of unique GMAT questions
-- 100s of handwritten 'digital flip books' for OG questions
-- 100% Free Trial and less than $20 per month after.
-- Free
GMAT Quantitative Review
