Must for Applying Concepts

I purchased GMAT Club Tests Subscription for a period of 3 months and I must say they are a must have for people looking for higher scores and also it helps to understand how to apply concepts learnt in theory in varied ways.
Secondly,It helps to learn shortcuts given by BB which will help during the tests.
Though its 700 level questions are way tougher than actual gmat, its 500 and 600 level questions are the ones that make it unique and even if someone is solving these two category questions they would be able to improve and memorize formulas and concepts.
I would highly recommend GMAT club tests for quants.Verbal Section of this is okay for practicing and managing timings.