Gmatclub tests - One stop Shop for all your Quant worries

I have primarily used Gmatclub tests for my Quant preparation.And in my honest opinion if you're facing any difficulty or just want to hit the top gear for GMAT quant preparation, Gmatclub test should be a must have arsenal in your kitty. They have a huge database of problems with over 50% of problems of 700 level(or of a higher difficulty). The best part is one can attempt 20+ CATs for quant itself or can create customize quizzes to improve on weaker areas. A succinct solution for every question in the database by none other than Bunuel is an icing on the cake.
If you have these tests, you won't need any other prep material for Quant. Period.
I would strongly recommend these tests if you really wish to score in that top bracket[49-51].
One suggestion to make them even more lethal : I would recommend that creators try to add more questions that use the language tricks(like using complex verbiage or concealing important data ) used by GMAC.