Three traditional paths to IB summer internships and eventual full time analyst jobs are as follows…
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Attend 1 of 6 ivies (or other elites like Duke/Stanford/ Chicago) that don’t have business or finance majors and concentrate on Econ or other humanities major. Engage heavily in on campus finance related organizations. Start building network early and take advantage of traditional “target” school resources and access. You will be facing steep competition amongst peers but most IBs have a large number of slots available for this cohort. Study whatever raises your intellectual curiosity just be prepared to speak to its creation of transferable skills such as problem solving, communication, etc.
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Attend a premier institution that has a business or finance concentration. Think Stern, Dyson, Wharton, Cox, Gabelli, Ross, etc. Make sure you get very good relative grades and catch the attention of professors. Day one start looking for internship and know you are competing with everyone around you. Take advantage of traditional “target” school resources and access but you will need to find a way to stand out.
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Attend a top tier “feeder” LAC. Think Williams, Amherst, Hamilton, W&L and major (primarily in Econ) or other humanities areas of interest. You will need to be proactive and likely will have fewer finance organizations to participate in. You may be at a target school but with no on campus recruitment. Seek out alumni aggressively and early. You may have to articulate a narrative as to why you choose this path.
None of these approaches are necessarily better or more likely to succeed but they do offer a very different college experience. Does one sound more appealing OP? You seem to have a mix in your list but would suggest narrowing it down based on which of the three learning and community environments is most appealing.
FYI of course there are other ways to get to IB but these 3 are by far the most frequent.