Going by your thinking, it would be lot more easier to take the exam in Tier 2 cities of India, where #takers are way to fewer than compared to #takers in New Delhi or in Spain, where the general population is not that good in English.
So the only fact that works well in GMAT is how have you prepared for the test. If you had prepared very well then I don't think that any myth will hinder you in destroying GMAT.
Don't bother about these myths and just prepare for the biggest achivemsnt of your life.
Hope that helps.
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