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I totally had to guess on a few questions...and I barely made it at the end and had to do some random guesses. I completely botched the quant, by throwing off my pacing in the beginning. I know with another two-three questions correct I would have had a 680+, and probably would have been content. I'm shooting for a 700. Question is can I do it in the next 90 days?
What was crazy was most of the questions I saw on the test, were nothing like I studied. I had practiced all these hard level questions, and all I saw were a bunch of interest/profit questions I feel. I suck at basic arithmetic, so I think that also impacted things.
Yes I would. MGMAT questions are long and a total pain in the butt to read and solve. Challenge questions are shorter - more similar to real gmat questions. Also challenge questions have all sorts of little gotchas that will force you to really pay attention (even though the questions are short) and avoid silly errors which totally kill the gmat score. You'll also be forced to learn shortcuts to solve problems, or to guess and move on for the really impossible questions.
GMAT Club challenges are great practice for your patience and concentration. The sets are pretty difficult, so leave your pride at the door. Most of the time I finished a challenge thinking I just kicked ass and ended up in the 50th or 60th percentile with anywhere from 8-15 questions incorrect. I guess it just goes to show what kind of quantitative talent we have doing these sets!