GMATclub tests are the only material you would need for quant if you are a Q47+ test taker. The questions are hard and have been designed to think in the GMAT way. These questions will help you identify the common concepts tested in the GMAT and the common mistakes a test taker is bound to make.
I used these tests for practice, improving my timing and ability in few sections such as number properties. I would recommend these tests for anyone who needs practice and needs to improve significantly on the quant. I did the tests every alternate day and reviewed the explanations given by expert. The explanations always introduced a new method or concept which changed the way I looked at the questions. Thank you GMATclub.