Generally I would suggest these tests to those who have mastered all the basics and exhausted all the official questions, those people who have reached 700 hundred level.
I would suggest taking GMAT Club tests way before your exam. As it will help identify your weaknesses in tough questions, you will have enough time to work on them.
Verbal: Very hard and may be discouraging, but will give a good indication of how you will perform towards the end of your actual exam.
Quant: Unnecessarily hard; some questions take more then 3 minutes, even those at the beginning of the test.
These were my experience, not necessarily have to be yours too.

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Experts’ Global provides greatest value for your money. There are 15 mock tests 1 is free, 14 costs $50 only. These tests are very much representative of an actual GMAT exam.
Timing in these tests tells how you manage your time in actual GMAT.

Quant: The closest quant section I have taken ever, after Official GMAT Prep tests. You can identify your weak areas in math, as Experts’ Global has detailed analytics of your performance. Each question has both written and video explanations.

Verbal: SC, CR and RC are very similar to official questions. However, CR has some old type questions that do not appear on GMAT frequently, same applies for RC. RC passages are longer than actual GMAT. But, the length of the passages are compensated by the difference in the difficulty of questions from official RC. Overall, Verbal is good.

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