I got 6 months access to GMAT Club tests by purchasing e-GMAT course.
I found GMATClub Quant tests a bit tricky. you'll have to be thorough with the concepts to apply these to the questions in under 2 minutes.
If you would like to build your concepts then GMATClub forum is an awesome resource to study and prepare your basic Quant skills. Once you have got exposed to all the topics then its time to asses your skills and GC Quant tests is the most comprehensive test platform to assess and improve your abilities.
These have been my GC Test scores:
Q1: 50
Q2: 42
Q3: 45
Q4: 47
Q5: 44
My Actual GMAT quant scores:
GMAT1: Q48
GMAT2: Q49
GMAT3: Q49
As you'll notice a consistent Q45+ score on GMATclub tests will translate to Q48+ score on actual GMAT exam.

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I would love to thank the GMAT Club for making it possible for me to move from a disappointing Q37 to Q49 on the actual test. I before taking on the GMAT Club tests used the Quant Thread on the GMAT Club to work on the basics. After going through the basics I was able to solve the actual GMAT questions but I kept on making careless mistakes while doing so, because of which I was not able to push my score in the Quant section.

I thereafter started using the GMAT Club tests, taking one test per day. My strategy was not to focus on time but to develop my abilities to solve any question. So I would take as much time as I wanted to solve the 31 questions on the test without looking at the answers (Generally about 90 minutes) and then would take a break of 30 min and then do a detailed review of each of those questions (Generally 2 h 30 min). I would look for where I made mistakes, did I got the correct answers because I truly understood the concept, or was it a flook. I would bookmark the questions that I would like to solve again.

As I moved through the complete set of GMAT Club Tests, I could move my score from Q 37 to Q51. In the lasts few test my scores varied between 50 and 51.

On actual GMAT I was able to score Q49, which was at least one point less than my expectations but still it was a massive improvement from a Q37.

I would always be thankful to this community for helping me get to a score of 690 based on which I could process my applications further.

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Gmat Club tests are a little harder compared all the quant material I've found elsewhere. However, its one of the finest as well. If you diligently go with it and look into explanation of each concept, it would really put you in great standing in terms of Quant atleast. The verbal was slightly hit or miss from my perspective atleast.

The interface is also GMAT like. I would really suggest not getting bogged down by scores when starting out because they might be low. They really grill all the concepts very well. Highly recommended! If you are aiming for Q50-51 - its a must.

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I had been struggling with improving my Quant score and had tried many free resources available, but nothing helped like GMAT Club tests. Quant questions that feature on these tests are harder and prepare you in the best possible way for the actual exam.

Combine the tests with the vibrant forum with many experts helping out and you have the best resource ever. Clear explanations, follow-up questions and friendly forums make this a great place.

Comparatively, I found verbal questions to be not as difficult as the quant ones. Quality of questions also was much better for quant than verbal. But still, I could learn a lot of new techniques in verbal section too.

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Gmat club tests are good for its quant in my opinion. It has got very good set of quant questions which on solving gives confidence to solve 700 level questions in gmat and it is in par to 700 level questions in gmat. Quant questions made by Bunuel are amazing and worth it to try. As of verbal, Im always more inclined to Official guide questions. But the verbal side, I personally feel OGs are the best. But we can create collections and use the already created collections in the gmat club. In quant it was really helpful, as you can have collections made by Bunuel and BB themselves. Practicing that questions is lot more worth it.

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Overall, GMAT Club Tests are an excellent source for quant. The questions are much trickier than the Easy/Medium questions from the OG guides and even the "Hard" questions from the OG guide.

GMAT Club Tests really makes you think outside the box and learn many concepts that make GMAT quant questions tricky. Bunuel is a legend when it comes to explanations, and he does a fantastic job of creating these questions, which test your quant fundamentals to the max.

One recommendation is that you should attempt these questions only after you complete the GMATclub Quant book. Attempting these questions without having a solid quant foundation is just wasting your time.

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This Quant tests mostly consists of 700 above level question. Thus it helps you get acquainted with tough questions.I took 8 quant tests and my score varied from Q42- Q50 and on actual GMAT exam I scored Q49. I would definitely suggest gmant club tests for Quant.
Also verbal section I believe it's not up to the mark.You will not find satisfactory solution for some questions.But still it can be a decent tool for practice, the questions forces you to think and apply the concept you learnt while studies.
Overall a good test that I would suggest to get after completing GMAT Prep and Manhattan tests.

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Quant: Lot of challenging questions that test your ability to read the question properly. Ample practice to make you feel confident in the real exam. a tad higher level of questions than the actual GMAT but if you are targeting a Q48+ you will definitely find it useful. Once I started to solve, at the beginning i was very disappointed by my performance but eventually I got used to it and overcame how to look at the questions from all the angles possible and my performance in Mocks improved drastically.
Verbal: I did not find the questions upto the mark and hence did not solve all the questions.

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I got gmatclub test free for two weeks. Initially when i started my quant score was 28. but eventually after writing five test, my scores have improved to q48. Do not get intimidated with you'r starting score. See the explanations and keep practicing. You will see you'r score improve. These tests are pretty harder than the actual gmat tests. But if you are able to score on this, you'r GMAT math score will definitely be higher than this. The verbal is also good. The explanations given are crisp and clear.

Overall they have good collection 700 level GMAT questions for someone targeting 700+ on GMAT.

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i have been using the gmat club tests to supplement my preparation and i must say that at-least for quant, these tests are ideal for identifying conceptual gaps and ironing out nagging issues in your prep. Solving these questions will automatically make you a more careful person and help you in staying clear of the usual traps which cost valuable points during the tests. Although these tests are on the higher side with respect to the difficulty, completing timed tests with questions of higher difficulty will undoubtedly ensure that things are easier on test day. Moreover, the fact that forum discussions are linked to each question's solution ensures that you can see the various ways in which the questions can be solved. This is especially useful if you need alternate solutions to the questions, especially identifying approaches with which the applicant is comfortable. Lastly, the fact that you can give them as quizzes means that you can work on questions from a particular topic to become strong in that topic. I would recommend the gmat club tests to all individuals preparing for gmat.

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