I have solved most of the ''GMAT Club tests'' questions. Makers of these questions really deliver what they stated. Hardest quant questions I ever solved during my GMAT preparation. Explanations and ''less time consuming approaches'' are very helpful in learning. In these question almost every quant and verbal concepts are tested. Even if you get the wrong answer then there is so much to learn. Every question gives you something to understand. Both verbal and quant parts are composed of good quality question. If you want to measure your strengths and weaknesses on a high level, then there is no best product available other than ‘’GMAT Club test ‘’. I surely recommend these tests to everyone who is one his or her path to B-school.