An extensive, multi-year track record of extra-curricular involvement sends the message that you engage with communities you care about and have the energy and drive to be involved even when you are busy with work or studies. This trait is very attractive to admissions committees. It also reduces the suspicion that you've simply joined an organization to "pad" your MBA application. Nevertheless, I believe that the real reason MBA applicants with community service leadership are more competitive is that their involvement provides additional evidence that they have the desire and ability to lead. On that front, if you've only been involved for six month but taken a leadership role and made an impact, the experience will serve to provide evidence of your leadership potential.
I recommend you send as many signals of interest that you can to the MBA programs at the top of your target list. Recognize that schools are very concerned about yield (that if they offer you a spot you'll take it) so when they perceive a strong degree of interest on the part of a candidate, it increases the likelihood they will offer that candidate a spot. Overdo it is my advice -- attend information sessions, visit campus, interview students and alumni. An highly-engaged, knowledgeable MBA applicant is a more competitive applicant.
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