A must have for Quants prep

The tests were good to learn new concepts, but I have always felt that taking these in untimed conditions was always better. Ofcourse these questions are of much higher difficulty than the actual deal, so good for practise.
You end up learning the way to think smart using numbers or some handy formulas like how to find number of 5 in 50!. But i think they are not representative of actual GMAT. Bunuel's explanations are out of world, simple crisp and just what you need. Be sure you solve some 10 of these tests and maintain crisp notes for the same
Strongly recommend these as a final layer to your GMAT preps. I found verbal tests not upto the mark, so dint attempt much.