Gmat club tests have questions which are on an average above the GMAT level. Even after completing all the study material I could find them very challenging. More than the question the forum discussions are truly an eye-opener. Bunuel and his short key and direct solutions just unravel a seemingly tough question in just a few steps. His way of explanation is very elegant and easy to understand. GMAT Club Tests are the ultimate tool to obtain a better score in GMAT Quant section. No other test series or question set can even come close to it. One needs to just finish the basics and then start solving GMAT club questions daily and trust me improvement will come. There is a huge selection of question ranging from 500 to 750+ level questions. There is no dearth of questions on any topic. The questions are well researched and test the basics of the candidate. It has helped to get a 2 point jump over 4-5 months. But I am preparing for the same again and will further use GMAT club tests to prepare. It is not only important to keep on solving the questions but also to revisit them once in a while. In my GMAT test there was hardly any question I hadn't seen in the GMAT club test.