Good thread, guys - I'd like to add a few things:
1) The way that the test is scored, you can miss quite a few questions and still do well...because of the adaptive nature of the test, it's designed to challenge your threshold of ability, and for you to miss questions somewhat frequently so that it can assess your level.
2) More importantly than that, your job when taking practice tests is to learn:
-How you pace yourself on test day, and how you need to improve
-What mistakes you're making under test conditions
-Which topic areas and question types need more work, both in terms of speed and accuracy
Ultimately, the only score that counts is the one on test day, so I wouldn't spend too much time analyzing the score from your practice test...even if it is artificially high or low by 30-40 points, simply knowing that won't absolve you from having to answer the questions correctly. So, more proactively, look back at the questions you missed, the questions on which you spent more than an average amount of time, etc., and learn from those.
Far and away, the greatest value you can derive from a practice test is a diagnosis of your testing experience, and giving you a set of areas to emphasize for subsequent study. Overall, I'd reason that your score is probably pretty close to, if not identical with, the one that the computer posted for you...but ultimately that doesn't matter. The questions you missed, the errors you committed, and the things you learned about yourself in the process - those are actionable details that can help you ensure that your score on test day is as high as it can be.
Brian Galvin
GMAT Instructor
Chief Academic Officer
Veritas Prep
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