If you want to improve your quants score to 90% , try at-least 70% of gmat club questions and tests.
Lot of good and tough questions in single place .

Pros:
Good selections of quant questions
detailed answer explanations
enable you to find new shortcuts
Improve your timings

Cons:
Not adaptive like GMAT
Scoring methodology can be improved
if you tried other tests by different clubs (e-gmat, manhattan), you may see some repetitive questions.

My recommendation is take detailed notes for all the wrong answers , review the answer explanation , find new shortcuts . This feedback loop process will improve your score .
Finally time all the tests , it will help you find new way to solve the complex quant questions.

But overall wonderful resource to improve your GMAT score.

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Very good value for money. Quant questions are representative of GMAT difficulty, so you are not taken by surprise on the real exam. There is a variety of questions for each target area, so you get plenty of practice. I especially liked the option to create your own quizzes, where you can pick specific area to practice as well as desired level of difficulty. The integration with forums is also nice - I learned more efficient/different approaches this way, which helped me to be more flexible on the exam.
Overall, this is a great source for practice purposes. For basics and general strategies, check out other materials such as forums, MGMAT, Veritas, Math Revolution...

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The quality of questions is very nice.
The quizzes helped me a lot to understand my weaknesses. I appreciated the Quant part of the tests. There are many questions which are extremely useful in order to understand different patterns.
The Quant part provided a satisfactory experience however I have two concerns:
-not all Questions are GMAT Type -They are exceedingly difficult in some cases(at least to solve them within time allotted)
-The explanations provided are not always satisfactory
Regarding the Verbal part, it is less worth in my opinion, since many of the questions in the bank are similar to those in OG.

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Best practice for quant exams. Must have for scoring a 50 plus in GMAT quant. It makes you think like a pro. Not only in GMAT, you will start looking problems in different way. The approach itself will be different. You might have had a lengthy solution, but when you review the solution, it will be in two to three lines. Do not miss even a single problem of 700 Level. You can use the 600 level problems as a brush up of your basics. I suggest the tests to everyone. If done with this series, never worry about anything. Just go and give the exam.

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GMAT club test are awesome for quants. It really pushes your limits to score in high 40's and even 50's. Quant sets have great mix of difficulty levels. These sets are very challenging and great practice to score high in Quants. I think predicted scores for quant tests have a deviation of around 4-5 in real test, considering that quant sets are of higher difficulty level. The verbal sets are not quite reflective of difficulty level as in real test. Critical reasoning questions are easy and need to be revised to reflect the difficulty level of real Gmat questions but RC's were good practice.

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The tests were good to learn new concepts, but I have always felt that taking these in untimed conditions was always better. Ofcourse these questions are of much higher difficulty than the actual deal, so good for practise.
You end up learning the way to think smart using numbers or some handy formulas like how to find number of 5 in 50!. But i think they are not representative of actual GMAT. Bunuel's explanations are out of world, simple crisp and just what you need. Be sure you solve some 10 of these tests and maintain crisp notes for the same
Strongly recommend these as a final layer to your GMAT preps. I found verbal tests not upto the mark, so dint attempt much.

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Alright,
In my experience I found gmatclub tests to be good but not great. The reason? Its more quant oriented. If you want unlimited supply of tough quant questions, gmatclub is an amazing resource. Though I didn't it extensively as I already scored a Q51 in quant!
My pain area was verbal and I found it OK. Its good for practise sake but it could have been better. Explanations sometimes keep asking me for more. May be because I'm relatively weak in Verbal. Anyways, I would recommend gmatclub Quant for any1 who is absolutely through with the basics and is looking for some good quality practise. Getting Q50-51 in quant is very much possible if you practise enough and gmatclub is a great resource. For verbal don't consider gmatclub as a primary resource though its good for additional practise.

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I must say that the level of the questions in both Quant and verbal is excellent .
I have taken coaching for GMAT in July in Bangalore from a well known institute in Bangalore. After doing GMAT club tests , I find that I have wasted my time having attended that coaching.
Had I invested my time here solving questions on GMat Club,I would have been ready for the exam by now.
All that I can add to the review of free club tests is that Explanation for some CR questions could also have been provided.
However, the tests were a real motivation to me.

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These tests are really very helpful for you to practice questions of all difficulty types. It includes a lot of tricky questions which prepares you to tackle any sort of difficulty you might face during your exam. I really liked the way you get a detailed score analysis of your test and see how other people have fared in the questions compared to you. And the best part is while i review my answers i can see the detailed solution right there along with the forum discussion where people discuss alternative answers. The only thing i would suggest is to increase the number of verbal tests so that everyone gets a good practice with the verbal section too..

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GMAT Club Test QUANTS: There are around 1300 hundred questions in quant section with low, medium and high difficulty levels. These questions are one step above the Real GMAT questions. Questions comprises every concepts of questions tested in real GMAT. Most of the questions are above average difficulty levels. From every question, you will get something new. Most of the questions are not seen anywhere else and created very intelligently including small small tricks. The solutions given by Bunuel are brilliant and tests basic concepts.Also the discussions are very helpful.To score Quant 50 or 51, these tests are highly recommended.

Verbal: I have gone through the SC questions which are build on the GMAT concepts but real GMAT verbal questions are little different wordings which makes them little difficult. I have done some CR questions which look pretty much similar to real GMAT. The verbal tests have a scope for improvement.

The Interface is similar to the GMAT exams and works very well.

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