GMAT club tests are one of the best resources for Quant prep. The tests will help to build a strong foundation in basic concepts as well as contain a strong pool of challenging questions. The explanations are solid and unambiguous. After a few attempts at the test when I could not complete on time, I figured that timing was one area I had to improve on. Gmatclub tests are perfect for building your proficiency on hard questions, working on your time management as they provide a balanced mix of challenging questions to help you aim for a higher score.
I would highly recommend the quant tests for anyone aiming for Q49+ score.