The Gmat Club tests are a must have if you are aiming for a 700+ score. I had taken my last GmatClub CAT before November 2015, hence this review doesn't cover whatever improvements have been done after that time.

The quant part of the CAT have the best questions that you will find anywhere. And it's not just the questions themselves, the explanations provided also help you uncover many shortcuts and help strengthen your core concepts. Admittedly, I found them to be a little harder than the GMAT quant questions, but that should help you be better prepared for the final test. And also, you can take the quant section or verbal section one at a time, which gives great flexibility when you are hard pressed for time.

Now the not so good thing about the tests... Although the questions themselves were top notch, the scoring algorithm seemed to be a little off. My quant scores in the CATs were a little spread out (45-50) and the hard questions keep coming at you from around the first 5 questions, which wouldn't usually happen in the real exam. So you might find yourself running out of time, but again, this should be good for practice.

And the really bad part about the tests? The verbal section! To me it was utter waste of time. I completed 3 verbal CATs and scored V30/31 in all of them (I'm really not that bad). Quite a few of the answers seemed debatable and few questions were not very GMAT like.

With all these pros and cons, I used my GmatClub tests subscription for 6 months and then I had renewed it for another 6 months. Simply because practicing the quant section really helped boost my confidence. The first time I got a Q50 in the GmatClub tests I felt like NOW i'm ready for the actual GMAT. I had used the GmatClub tests along with MGMAT/Veritas tests to practice the CATs, and I will suggest the same strategy to others appearing for the GMAT.

Gmat club tests are most reliable tests. In my experience while preparing for my Gmat1 i have been using these tests where i used to score Quant 42 and verbal 25-27 and i scored the same in my real Gmat exam(Q-44 and Verbal:-25).Quant tests are very useful to learn/approach advanced questions and to refine one's skills and pacing. They also provide difficulty level of questions where you went wrong in Results. It will be really helpful if we were provided full length mock exams in addition to Quant & verbal tests!. Would like to very much recommend the gmatclub tests for one's preparation towards the GMAT.

I have a dear chance to get to use GMAT club Tests , which coincides with my rush preparation for the upcoming test. It was a valuable resource so far for me to be aware of my current situation as well as focus my efforts on important areas where I lack some certain knowledge/ skills.
The test Center is structured in the way that you can easily spot what you would like to do: take quizzes, proceed to CATs or review your past performance.
Free test includes those provided by Gmat Club, Knewton or Manhattan GMat. While Knewton provides you with sets of questions based on Verbal areas of CR, RC, SC or Math areas, Manhattan GMAT comes with challenges set of Math topic.
On the other hand, CAT's breakdown includes full set of Verbal(9 test) or Quant (26 tests).
Tests are all timed with subsequent performance assessment post testing time in which you could easily track your performance in terms of result, average completion time, comparison with other test takers and intriguingly, how many questions you pass with guessing. Level of questions(ie: 500, 600 or 700) are also supplementary for your awareness of your current situation and estimate of how much more effort you should spend.
After months of preparation, I was astonished by the quality of questions and the relevance to actual GMAT. Some tough questions, such as SC with long modifiers and complex vocabulary are really effective for skill building.
I would recommend the GMAT Club tests to any test candidate.

I enjoyed the GmatClub Verbal test although I would have appreciated them to be a little more consistent with scoring and a few more in number. They are deffinitely a little harder than the actual test but gives you assurance that you will do so much better in the real test. The interface is very gmat like and makes you indeed feel like you are taking the real exam. I am good at quant so didnt try a lot of the quant exams but can tell from my limited experience that they are wayyyy harder than the actual test. If you are coming from a technical backgroung real gmat quant is going to feel like a breeze.
Overall a great product that I recommend to everyone.

GMAT Club tests have proved to been really helpful. The computer adaptive test closely resemble the real exam situation.

Quality of quantitative test is top notch, all the topics are properly tested. For Gmat quant, you do not need any extra practice besides what the GMAT club tests provide.In addition, you also get super useful analysis( weak areas, timing, how others are performing)
I would definitely recommend taking these tests to start your test prep.

Verbal Review: The verbal tests were okay, special focus should be on RC question. In real exam RC question are not as big as they are in GMAT Club

The gmat club tests are very close to official test paper , their adaptive algorithm their detailed explaination and time and complexity base analysis is superb and provides a lot help to improve your performance.

There are multiple section of test center like CAT, quizes etc.

Gmat club tests are available free on some specific days and can be subscribed with affordable amount . truely worthy.!!!!

I would recommend everyone to make use of this platform and tests to get the feel of real test cases.!!!

they are must have to be in your practice tool set.!!

Thanks gmat club for providing such a helpful test kit.

A must have if you are aiming for a 700+ score.
Quant:
The best questions you will find anywhere. The explanations provided help strengthen your core skills. I have raised my Quant score from Q44 to Q49 using these tests. Don't place too much emphasis on the Score, as the Scoring algorithm might set you off. But, unquestionably these are best tests in the market for Quant practice and concept building.
Verbal:
The verbal section needs improvement. The questions were not at par with the actual GMAT's questions but still good for practice. Again, the explanations provided also needs more improvement.
Overall:
I relied heavily on GMAT Club Tests for Concept building.
The question types that I had noticed in GMAT exam quite closely resembled those in GMAT Club tests (especially quant.) The variety of practice questions in GMAT Club Tests is awesome!.I found GMAT Club Tests to be very helpful and critical in my preparation for getting a higher GMAT score.

I have solved most of the ''GMAT Club tests'' questions. Makers of these questions really deliver what they stated. Hardest quant questions I ever solved during my GMAT preparation. Explanations and ''less time consuming approaches'' are very helpful in learning. In these question almost every quant and verbal concepts are tested. Even if you get the wrong answer then there is so much to learn. Every question gives you something to understand. Both verbal and quant parts are composed of good quality question. If you want to measure your strengths and weaknesses on a high level, then there is no best product available other than ‘’GMAT Club test ‘’. I surely recommend these tests to everyone who is one his or her path to B-school.

The gmatclubtests really provide you with the most suitable gmat-like questions for quant practise. Save some time to take them. Combine them with a good course to help you with theory and templates and keep grinding on the gmatclubtests !! Preferably use them as quizzes, because i found that they are hard taken as tests and might destroy your confidence. The gmatclubtests are a good source for Q50-51 questions. I know that because i messed with some questions in my test and i never got to see these Q50-51 questions. I got a Q47 actually. But now that i am going for a higher score, i believe i have found the know-how. These questions will stress you and test you to your limits without going out of the gmat concepts. They also have a big number of medium level and low level questions so if you are not aiming for the Q50, start with them. I find it very helpful to print the questions i get wrong with the expanation from Bunuel(great work) and any other explanations i like ( each question is discussed in the gmatclub where you can go easily and quickly and i usually print one -two more fast explanations for later review. A tangible error log can help.
Great work, great rescource for practice and big goals.

The Gmatclub tests are the best learning tools to get a high score. The concepts tested cover everything from the basics to the most advanced difficult concepts you will face on the test day. In fact I believe that if you attempt all 1500 questions, you will be more than ready for the actual test. The Quant section is above and beyond what you're expected to know on the GMAT. If you can master all the concepts there's nothing standing in your way. You will crush the actual GMAT quant section.

Make sure you get the most out of these tests by reviewing the questions you get wrong and doing timed tests. Don't worry about the score you receive because its not reflective of the actual GMAT score you will get. In fact you will get a much lower score on the gmatclub tests than the actual test. So don't worry about the score and just continue practising!

All the best