The way I practiced Gmat problems consisted of (approximately)75% doing random problems (all difficulties) and25% doing "hard" problems . Why did I dedicate 75% of my time to solve "random difficulty" problems? Well, when you take the GMAT exam you'll see that it will be very hard to gauge the difficulty level of the questions (and you should not even try to gauge the difficulty because it will mess up your concentration). This happens because some 700 level problems will seem
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