What makes Caltech so notoriously difficult?

[collegealum314]

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I’ve however only gone up to calc BC. Also, most students had been admitted also to multiple other top schools like MIT, Stanford, Yale, Princeton, but I’ve been rejected from both MIT and Stanford; would that mean I only got admitted due to luck and do not really have the skills to survive at caltech?

MIT is unpredictable these days and Stanford values non-academic activites a lot in admission. Rejection there doesn’t tell you anything about your abilities.</p>