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<p>The official answer is that it’s never too late. There are plenty of older people seeking to become doctors as second careers. You can take the pre-med courses at any time, as long as you take them.</p>
<p>As a practical matter, fitting the required courses in two Columbia years will be nearly impossible if you have to deal with lots of major requirements. If you’re thinking about it, you should at least take the intro science courses early on.</p>
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<p>Generally, it’s the other way around. People who can’t handle organic chem end up doing poli sci ;)</p>