Best student's profile for springweeks and IB career

Good evening Everyone,

actually I'm a last year high school student in Italy, and during the past 12 months I've become interested in IB careers.

So I want to "build" my own profile as well as I can, not only starting from grades in high school, but also with extracurricular activities.

I've chosen my target course here in Milan, in Bocconi University, and I'm applying to get into it, but I think there could be much more work to do.

First of all I'm reading different magazines such as The Economist, TIME, Harvard Business Review and Bloomberg, and I want to keep following WSO.

I'd like to publish my own business journal (online) and so I'm searching for partners but I think this is not enough, I have plenty of time and I want to improve as much as I can, so I'd like to ask you HOW to exploit my abilities and interests, with the aim to participate in a Finance Springweek next year (GS, JPMorgan...) for a better future in Investment Baking.

Any idea on how to better one's profile and eligibility for a special program? Does anyone know how to improve my position and grow up in this field?
I think that starting as soon as possible would give me better chances to deal with competition and hard work!
Any comment and advice would be very appreciated, feel free to tell your opinion!