Gmat club test are one of the best resources, I have came across during my preparation. following are the reasons why i prefer it.
1. One of the most complete experience. With Q25 tests and V9 tests , it provides a complete experience with wide variety of questions.
2. Gmat club questions are one of those tests who use adaptability algo of gmat. which means you can have test day experience very easily.
3. Wide range of questions. With over 1900 questions gmat club provides all kind of variety in question. specially for quant, for quant, Gmat club provide one of the toughest experience. one who is targeting Q51 must go through this.

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