GAMTClub tests have some great questions for practice and the question pool is large enough for enough practice sessions.
Also, to built my stamina and get myself more familiar with exam timing constraints, I have take multiple gmat club quant tests.
I am not sure of what kind of algorithm they use to predict the quant percentile but I have enough confidence in Bunnel/BB that they might have done all sort of research (great example is their post on importance of order of questions in GMAT) before finalizing on the algorithm. So, In addition to great practice material, it also provides with you rough idea and where you stand.

Also, there are some great analytical tools to help you with post exam mistake analysis.
All in all, I feel, gmat club tests are must have for anyone preparing for gmat.

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Gmat club test has made a huge impact on my GMAT Preparation. It gave me a clear view on my weak areas and gave me an idea on where i stand. It helped me analyse where all i went wrong and the difficulty level of the Quants questions were also pretty good. I am glad that i chose this test.
The Quant tests are good for practice. But verbal could have been better. Good explanations available for most of the Quant questions. They Could have added more Verbal tests. Also the explanations for verbal tests could have been much better.Finally,Gmat Club Test are very good for Quants practice.

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I have used these tests to polish my quant and I must say, these tests will test you to the core. The solutions by the makers are really structured. It has a large question bank which covers almost every topic, plus it gives you the flexibility to choose the topics. The best part about the tests is the analytics provided by the software. It will depict the weak areas and also shows the percentile score along with the difficulty level. This really helped me identify my weak areas and dwell more on the topics I feared. A must-have for 700+ plus score

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I mainly used tests for quant practice and I liked it a lot. Questions are much more trickier that actual GMAT's ones but very clever so most of the questions test several areas. I also liked the explanations and the discussion under each of the questions. Stats are also very powerful (time spent, breakdown by correct/incorrect answer, timings for each question, comparison to others) while test's interface is similar to the real GMAT's one. I have not tried any verbal tests yest but quant practice actually boosted my score from 40-42 to 46-48. I also got rid of timing issue on official GMAT tests and finish quant section with around 5 spare minutes now (vs rushing at least 5 questions to make it on time).

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It was an amazing experience learning from the mistakes that you did in these toughest exam questions available in the market. Really the reviews are worth it!. really really amazing set of questions along with the detailed explanation of the same in the gmatclub forum really helped me in my prep

One of the best experiences in learning from the best people like banuel and a lot of experts posts that really encouraged me to put in more work in my prep. Really loved the forum!
Amazing! Amazing! Amazing! Amazing! Amazing! Amazing! Amazing! Amazing! Amazing! Amazing! Amazing! Amazing! Amazing! Amazing! Amazing! Amazing! Amazing!

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I feel that subscribing Gmat Club Tests was helpful to practice GMAT. Moreover, it is worth to buy.
I can even practice with type question that I felt weak on it, such as 600 questions or the hard 700 questions. I can also practice with only several questions, instead of the full CAT, in order to get usual of CAT.
Unfortunately, I did not have much time to practice. I will buy again and practice many questions as I can.
If I can give some suggestion, It will be more helpful if I can get an immediate response from an expert about the answer that I can not understand the reason.

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The GMAT Club bank of questions is the best resource where you can improve your Quant score. I did all the CAT tests and always review the wrong answers and I have to say that the discussions under each question are the best way for improving your quant score. The option that you have for choosing only 700 level question is very useful for improving when you are around Q48-Q49. I also did all the verbal tests and read every discussion under each question and it was not difficult to match what you are reading in GMAT Club with the book or courses that you are using for preparing the verbal part.

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I purchased GMATclub premium membership along with the tests, just 3 weeks before my first GMAT attempt. It is one of the best investments I have made for GMAT preparation. By far GMATClub has the most difficult 700 level questions than any other test prep company. The bookmarking feature during the mock test is very helpful to review the error logs. With the premium membership, I was able to purchase the GMATclub app from the Appstore. The app was very helpful for me. I was able to practice SC and CR questions from my iPad/iPhone while I was travelling for work. A ton of free resources are provided with premium membership. OG Guide + GMATClub will definitely take you to 45+ in Quant.

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I firmly believe if u can just complete all quant tests ,you wont need anything else for a review. Moreover if you maintain an error log and review it regularly, you would be at the top of your game. Quant tests bring out minute details in question which can stump you in the real exam,especially the concepts which you might miss while reviewing .
Verbal tests are also good . But I would suggest if gmat club can add few more verbal tests, it would be a perfect package for preparation and reviews. At last I am happy to use these test. Wish you success.

Regards
Anurag

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Amazing product Was struggling with math and this product helped me hammer enough hard problem to really get into a groove. The explanations are far more creative with more novel solutions than other sources. Probably the best 700 level and highest volume I have seen yet. The verbal can be a little too hard so I would not get hung up too much on those scores, just use it to get ready time wise. After using this I went from a Q45 to a Q49, and imrpvoed my verbal to the 40s. Well worth the price, and the analytics are great as well

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