I haven't purchased the tests but one of my friend did who scored 700 in gmat. He told me gmat club tests played a huge role in getting good score in Maths.
I got gmat club test for free on St. Patricks Day as GMAT Club provides free access to all of the GMAT Club tests and questions during 12 holidays.

New Year's day 1/1/2017
Martin Luther King Jr. Birthday 1/16
President's Day 2/20
St. Patricks Day 3/17
Memorial Day 5/29
Independence Day 7/4
Labor Day 9/4
Halloween 10/31
Thanksgiving 11/23
GMAT Club Birthday 12/10
Christmas Day 12/25

I found tests really amazing, they showed my weak areas such as Rate and work, geometry and data sufficiency.

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Towards the end of last year, I made a decision to sign up for the gmatclub test, and i'm glad I did. Although verbal portion can be better, quant portion of the test is worth well beyond the investment. Besides the extensive amount of questions, explaination are often top-notch. It's even better because the system allows participants to pitch in on better solutions to approaching problems. To some all up, the interactive module, number of availalble questions, number of CHALLENGING questions, and top-notch solutions all make GMATclub test a steal for your bucks. Try it, and you will definitely see an improvement.

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I believe that GMATclub tests are the best tests out there for those aiming for 700+.

I took three attempts to reach my target score, and tried many resources before trying the GMATclub tests. For my third attempt I prepared using the GMATclub tests and got a 740 (Q50 V40).

My main struggle on the GMAT was the quant part, and my goal was to improve my quant score from 46-48 to a 50. Using the GMATclub tests I was able to do just that.
I found the tests useful for two main reasons:

1) The problems they have are very similar to the actual problems you'll see on test day;
2) These problems are harder than the problems on the actual test.

The GMATclub problems made me work hard every time and made my life so much easier on the actual test, because for 95% of the problems that the GMAT was throwing at me I knew I've dealt with a similar but tougher problem.

If you are aiming for a 50 or a 51 on quant you should get these tests - they're worth the price.

Good luck to everyone with the test!

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Quant
The quant test of gmat club is really awesome. Especially the problems of number system. Number system is one of the toughest section in GMAT and solving gmat club number system questions helps you achieve high level of accuracy in this section. I recommed you to please solve all these question twice, rembering all the concept you find new while solving problems.
others sections of quant is also very good. do solve all the question
Verbal
So far I have solved SC and CR question. In both the section you will find some of the good question. But explanation of many question is not upto the mark. But as GMAT CLUB gives you an option to ask directly an expert.So if you feel explanation is not sufficient, you can always contact an expert.
Thank you

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Despite the vast explanations and difficult questions these questions are exceptionally hard than other CATs. Def good to get you to the next level! If you are aiming for a moderate score and do not need anything exceptional you may want to look else where as those questions will be more similar to the ones you may see on the test.

This is packed with 700+ level questions however and a multitude of problems covering each sections. If you have problems with certain sections you can focus on those type of questions and the analytics although needing of some fine tuning can prove beneficial for areas you do not think you have a problem but the tests would disagree.

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GMAT club tests are one of the best test available currently. The math content is too good. All the topics are covered and in depth with sufficient questions for both PS and DS. The CAT algorithm is almost the same compared with the real GMAT test. The performance indicator is very helpful to analyse your weak areas. There are few bugs in the software related to the timing(it rarely affects your preparation ). Though there are not enough tests for English all the topics are covered. I would suggest to go for the GMAT club test especially for the MATH.

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Hi Readers,
we (GMATinsight) are a GMAT prep company and we have been taking all tests so that we can share with our studentsthe best test recommendation.
Here we wish to communicate to the readers that GMAT Club tests are trustworthy and are a very good practice. Where it's very difficult to trust the scoring algorithm of any test series, I found GMAT CLUB tests have very accurate scoring algorithm.

Although GMAT CLUB tests questions turn out to be more difficult than actual GMAT questions at times, still we feel the soul of questions remains the same as GMAT's.

We recommend GMAT CLUB test series to the GMAT Aspirants and although it wouldn't be right to make suggestion but if the cost of GMAT CLUB tests were lowered a little, many students might take great interest in them.

So readers, please be the part of GMAT CLUB community and earn points and kudos to redeem them against GMAT CLUB tests or simply buy them.

I congratulate @bb and @Bunuel for making these tests really a good practice.

GMATINSIGHT
Bhoopendra Singh

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Gmat Club Tests are very helpful especially when one aims at 700+ score. Tests are composed to enrich one's skills in hardest questions. Real GMAT is a little bit easier. But practicing harder questions will help you be more successful in real GMAT. On the other hand, GMAT Club tests are more focused on Quant section, so verbal section is much weaker and I used another courses and sources to master Verbal. I really appreciate the option to train only specific topic of questions with specific level. This has helped me a lot in practicing weaker parts of my GMAT test and surely helped me to score more in real test. To sum up, if you want to brush up your quant, I fully recommend GMAT Club Tests. On the other hand, if you feel weak in verbal, you should try to find any other course as a core one and use GMAT Club as a subsidiary source of materials.

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As a Naive GMAT beginner, I was very confused and used to score in mid 300 Range with Q 29. I was heart broken to see my scores.
I read my basics from various books and still my scores did not go up because I lacked practice.
That is when, I subscribed to GMATClub tests.
As there were 26 Quant Tests, I used to take 1 or 2 tests every week. I only kept improving with each test.
I ended up scoring Q 48 in the real test.
Thanks to GMAT Club Tests.
They are the best tests you can get your hands on.
All the best to who ever is considering to buy them. Close your eyes and just go for it.

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Hi, GMATCLUB tests are the best for quant prep. look nowhere else. Enroll today and crack your dream GMAT score. My wife suggested me these tests and got to say it really help me a lot. The best part is the analytics you get to analyse your speed, accuracy, and strong/weak topics. I wish all the very best to all the aspirants. The verbal tests are not upto the mark. The explanations are not that great. I didnt find them useful. For Quant, these are the best. Very very useful. Go ahead and buy them today. All the very best

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