You are asking the wrong question.
If you think 750 is the answer to your business school woes, you’ve already lost the battle.
No one needs a 750 GMAT to gain admission. It doesn’t hurt, but it won’t help at a competitive program if the rest of your profile is lacking. If you’re going to a degree mill, then sure a 750 might help, but why-o-why would you waste time and money on a degree mill???
Questions like yours indicate a deep disconnect from the value proposition of additional schooling. The MBA should serve you, not the other way around. Your score is far from the most important part of your application at reputable programs.
Can anyone of at least average intelligence score 750 on the GMAT within 2 years, yes. BUT – big but – the kinds of people who would spend 2 years in prep are not the kinds of students I see putting together well thought through programs of prep. So, while it is technically feasible, it is not likely.
The very fact that you’ve asked the question makes you less likely to accomplish this goal.
Critical Thinking skills matter, particularly if you hope to score >720 on the GMAT.
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