《Manhattan0 Roadmap》 Page214: A person who leaves the GMAT with a totally awesome 740 score is someone who spent half the test failing at 750- and 760- level problems.
You are going to need to sacrifice something in order to get back on track; you don’t have a choice about
that. You do have a choice about what you sacrifice. Don’t sacrifice problems in your fast and accurate
areas. Don’t tell yourself that you’ll do this question 30 seconds faster because you already know how to
do it, so you can just speed up. You’re risking a careless mistake on a question that you know how to get
right, plus you re going to have to do that on several questions to make up the two minutes that you’re
behind, so you’re really giving yourself a chance to miss multiple questions that you know how to do.
Instead, the very next time you see a question that you know is a weakness of yours, skip it. Make an
immediate, random guess and move on. There—youve only sacrificed one question, and it was a weakness
anyway. Depending upon the question type and how quickly you moved on, you saved anywhere
from a little under one minute to a little under two minutes. If that’s enough to catch back up, great.
If not, repeat this behavior until you are caught back up. On average, don’t skip
more than one question out of every five. Don’t worry if you see two “big weakness”
questions in a row, though. Maybe you got lucky and got that first one right.
Maybe one is an experimental. Even if they both count, getting two wrong in a
row won’t kill your score—you can recover because you still have more questions
to come—and you’re unlikely to have gotten them right anyway.