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<p>Very feasible, with some exceptions. I mean, you can’t jump right into high level math, physics, chemistry etc. if you haven’t covered prerequisite material. But say if you’re a person interested in government and you want to take a class about evolution but you don’t want to wreck your GPA, there are plenty of gen ed classes that cover various topics in the sciences.</p>
<p>Very few humanities classes have prerequisites and most assume you have no background knowledge. The ones that do say “Students should have experience in blahblahblah” or “Experience in blahblahblah helpful but not required” on the syllabus. It also never hurts to ask the professor / TF if you’re unsure. However, I would say that classes tend to spend little time covering how to write in their discipline (though I wouldn’t say disciplines like history and government vary too much in their styles). In one class I was in, a student wasn’t sure how to use sources in a “history-esque” way so he went to office hours and talked to the professor about it. </p>
<p>Finally, I would encourage all people to go outside their comfort zone very early on and take classes beyond the standard “freshman classes.” Of course, if you’re pre-med, sometimes it’s tough to do this. (But not impossible!)</p>
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<p>All ECs eagerly look for new people, otherwise they would die off! During “Visitas” there will be an activities fair and there’ll be another one during your first few days on campus. Each organization has people there to get you interested.</p>
<p>Publications like the Crimson, Harvard International Review, etc. all have comp processes that have certain requirements that you must satisfy before you become a full member. Each one has different requirements. </p>
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<p>I don’t know a ton about the whole consulting/ibanking/business scene but I can say that “top of the class” is an inappropriate term to use. “Class rank” is something that stopped being important the day you got accepted to college. They do want high GPAs, yes.</p>