Quality preparation and test skill builder

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.