"1. Building your profile
This takes place over six to 36 months.
This step includes various aspects that contribute to the strength of your candidacy as an MBA applicant. These include academics, leadership, teamwork, and career progression.
As an example, this may include your decision to participate in the social impact club at your college. For purposes of business school applications, decisions you make after high school tend to have the greatest relevance.
This is not to say that your journey before that does not count, but only to say that post high school is generally considered the most important time frame for most applicants. This is the time when you make decisions most actively, as an adult." …
https://www.businessbecause.com/news/admissions-stories/7154/10-steps-successful-mba-application