GMAT official Guide Math Supplement Grading?

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RBurroughs: Junior | Next Rank: 30 Posts; Posts: 10; Joined: Mon Mar 23, 2009 8:05 pm; Location: Philadelphia, PA; GMAT Score:610

GMAT official Guide Math Supplement Grading?

by RBurroughs » Mon Mar 23, 2009 9:16 pm

I've been google'ing for a while but can't seem to find how to score or estimate a GMAT score from the 176 practice test.

I missed 24 out of the 176 so that's about 85% correct.

I read somewhere that your score is where you get about 50/50 right and wrong. I'm not sure about the difficulty spread on the practice test, but my missed problems are pretty evenly distributed.

Anyways, I was wondering if there was a site or reference to find an approximation on "official GMAT guide" practice test scoring.

Thanks for your time,
Ryan

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Source: Beat The GMAT — Quantitative Reasoning | Mon Mar 23, 2009 9:16 pm

GMAT/MBA Expert

Ian Stewart: GMAT Instructor; Posts: 2623; Joined: Mon Jun 02, 2008 3:17 am; Location: Montreal; Thanked: 1090 times; Followed by:355 members; GMAT Score:780

by Ian Stewart » Tue Mar 24, 2009 11:27 am

You may read in a few places that the GMAT tries to discover the difficulty level at which you're answering half your questions right, and half wrong. That's not technically correct; the 50/50 level is used by similar tests which are 'free form', with no answer choices. Because the GMAT factors in the possibility of guessing correctly from the five answer choices provided, if you only answer half your questions correctly at a certain difficulty level, the test will assume you're below that level. You really need to be getting at least 60% right at a certain level to convince the test that you are at that level (and the percentage can actually be higher, depending on the nature of the questions, but these details aren't important to know much about).

As for your question, it's not possible to answer with any precision. No one knows, for example, the precise difficulty levels of the questions in the OG. That said, if you're answering 85% of the questions correctly, you're doing very well, and you'll get a good barometer of your current level by taking one of the GMATPrep tests.

For online GMAT math tutoring, or to buy my higher-level Quant books and problem sets, contact me at ianstewartgmat at gmail.com

ianstewartgmat.com

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RBurroughs: Junior | Next Rank: 30 Posts; Posts: 10; Joined: Mon Mar 23, 2009 8:05 pm; Location: Philadelphia, PA; GMAT Score:610

by RBurroughs » Tue Mar 24, 2009 2:43 pm

Thanks for your reply. I'm a little disappointed there's no way to gauge what my score range is.

However, I ordered the practice GMAT test that were offered when I signed up for the GMAT. I think you get two.

Are there any FREE GMAT PrepTests that offer scoring? I've seen a few offers but am skeptical to download anything that is "free", so any recommendations would be much appreciated!

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GMAT/MBA Expert

Ian Stewart: GMAT Instructor; Posts: 2623; Joined: Mon Jun 02, 2008 3:17 am; Location: Montreal; Thanked: 1090 times; Followed by:355 members; GMAT Score:780

by Ian Stewart » Tue Mar 24, 2009 4:35 pm

You can download the official GMATPrep practice tests for free from mba.com (there's a link called something like 'tools to help you prepare'). You need to register there first, but you need to do that anyway to book a test. GMATPrep is by far the most reliable indicator of your level, and I wouldn't put much stock in the score you get from a company test - some are very good practice, but none use calibrated questions, the official scoring algorithm, etc. Some give reasonably reliable scores, though not as reliable as GMATPrep, while others are very inaccurate.

I'd add that the database underlying each GMATPrep test is large enough that you can do each test a few times without seeing many repeated questions.

For online GMAT math tutoring, or to buy my higher-level Quant books and problem sets, contact me at ianstewartgmat at gmail.com

ianstewartgmat.com

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RBurroughs: Junior | Next Rank: 30 Posts; Posts: 10; Joined: Mon Mar 23, 2009 8:05 pm; Location: Philadelphia, PA; GMAT Score:610

by RBurroughs » Tue Mar 24, 2009 8:51 pm

Ian Stewart wrote:You can download the official GMATPrep practice tests for free from mba.com (there's a link called something like 'tools to help you prepare'). You need to register there first, but you need to do that anyway to book a test. GMATPrep is by far the most reliable indicator of your level, and I wouldn't put much stock in the score you get from a company test - some are very good practice, but none use calibrated questions, the official scoring algorithm, etc. Some give reasonably reliable scores, though not as reliable as GMATPrep, while others are very inaccurate.

I'd add that the database underlying each GMATPrep test is large enough that you can do each test a few times without seeing many repeated questions.

awesome. Thanks a lot