Must do for improving your quant score

The Good:
The best thing about Gmatclub tests is the quality of the questions and the intensive practice and revision of fundamental arithmetic , geometric and algebraic concepts you receive once you do it. I used Gmatclub tests only in untimed conditions as the tests were of slightly higher difficulty level to be completed in 75 min, but I would always feel more confident and stronger after doing these tests.

Scope for improvement: Like I said, the questions are of relatively higher difficulty and not very reflective of actual Gmat. So don't lose heart if you scored in lower range. I received 49 in my actual GMAT test but scored in late 30s and early 40s in Gmatclub tests. I still recommend these tests as they help to bolster your quant performance and are like bootcamp training for quant section of Gmat.