I think that the other two posts are right, you should not make your career decisions based on a b-school application. In the long run you will strengthen your apps far more by doing what is right for you at a given time. Pretty much all MBA interviewers will ask you to walk through your resume at some point during the interview, what's really important us that you are able to tell a coherent story and that you have good reasons for the decisions you took. If you choose the better compensation package because you have a young family to look after for example, then that makes perfect sense and shows personal sacrifice.
To answer your questions:
1 Get involved with something that you're passionate abou, where you can be a leader, and where you don't get paid. Perfect thing might be coaching under privlaged kids in a sport you love. I've also heard some great stories about people giving up their weekends to give wlking tours of historical monuments that they feel are important. Stuff like that goes down well, all I would say is don't do something that your not passionate about just to put it on your resume, that'llcome through in yourinterview.
2 - I think that's switch to IB is a good career goal, just be sure that you know what you are talking about and that your goals are realistic.right now it sounds like you want to be a trader, if not then the idea that you'll somehow be outsmarting the Market sounds a bit strange, just do as much research as you can into your intended career path before you write about it or step into an interview room.
Hope this helps.
RHB
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