I wouldn't take any individual practice test result too seriously, unless you're doing the GMATPrep tests. It's extremely difficult for GMAT test-prep companies to accurately reverse-engineer the GMAT, and none of them are able to perfectly reproduce the scoring system. So take Knewton's test result with a grain of salt. It's certainly possible to miss a bunch of questions and still get a 51, but 12 missed questions (or maybe 10, since there are only 37 questions on the quant, and not 39...?) seems awfully high for a 51.

More importantly, it probably isn't a great idea to focus exclusively on quant, unless your verbal is unbelievably good. You can't really cram for verbal, especially the CR and RC questions, so if you need improvement in that area, you'll probably need consistent practice over a long period of time. While I can't take the 51 completely at face value, it's clear that you have some pretty solid quant skills, and you want to make sure that your studies are at least somewhat balanced between quant and verbal.

I hope this helps! Good luck with your studies.
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Helping students kick the GMAT in the nuts since 2002... www.gmatninja.com.

If you know that verbal is a weakness and quant is a relative strength, then you should tackle the verbal right away. If you haven't already, check out bb's classic post about how to get started on the GMAT: gmat-study-plan-how-to-start-your-gmat-prep-80727.html

In his post, bb suggests starting your verbal prep in the second month, but if you're crappy at verbal, you should start working at it as soon as possible. In particular, GMAT critical reasoning and reading comprehension primarily test your ability to understand texts in a very precise, specific sort of way. If you struggle with those question types, you might just need tons and tons of practice so that you can get used to reading the dense, tricky passages that appear on the test. Yes, reading through GMAT verbal prep books can help, but there's no substitute for practicing with good, official materials.

Maybe your verbal isn't all that bad--I have no idea. But if you're scoring in the 46-51 range on your quant and your verbal score isn't strong, then it's probably time to mix in some verbal prep. Raising your quant score from a 46 to a 49 isn't terribly helpful if you score in the 20s on the verbal section. Check out the "month 2" part of bb's post, and then adapt it to suit your strengths and weaknesses. If you really are struggling with your verbal, then at least half of your time should be spent on it, since we know that your quant is on the right track. Don't completely abandon your quant studies, but there's no reason to wait to start studying verbal.
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Helping students kick the GMAT in the nuts since 2002... www.gmatninja.com.

thanxx to all

today i have taken mgmat test and got quant scoe q-44 with 64 percentile . i had answered 16 incorrect questions.

Also i have heard that mgmat tests are harder and we are definitely gonna chieve more than this on real gmat

So should i expect that i cen get Q 47 on real gmat .

what do you think