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After exhausting official materials and reserving them for the last few days, I wanted to stimulate the real test day experience.
The 15 mocks offered by Experts global helped me do so after I had reasonable confidence in the concepts.
For verbal, the questions are quite close to the real gmat especially RC/CR. SC could be improved a little bit on meaning questions rather than grammatical errors to emulate the real exam. There are a few challenging questions on Quant as well so a good test of your concepts.
In the last leg of my preparation, I used these tests every weekend (Saturday-Test Day and Sunday-Analysis). I would select the question types where I went wrong and figure out why. Then I would go to gmat club and check out similar questions.
I improved my GMAT score considerably to 720 and would recommend this to anyone who is new as well as who has exhausted official materials.