Deadlines for EA are in less than 2 weeks and I started only a few supplemental essays, can I reuse the same essays for other colleges?
You can reuse your essay but change it accordingly to the school like the "Why Us" prompts and the word limits. Since EA deadlines are coming soon you don't want to waste too much time re-writing similar prompts that you have answered before.
I would never re-use re-cycle a supplemental essay. Most HS students underestimate the importance of these supplemental essays and supplemental questions. I would say they are worth nearly as much as the main common app essay for T50 schools. College admissions readers can spot a recycled essay 9 out of 10 times. So why would anyone take the risk and potentially get their application sorted into the "unlikely to recommend" or "likely to reject" pile?
Yes, if the prompt matches but there are essays prompts that I don't recommend reusing such as the Why Us ones and anything specific to a certain school.
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