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I've submitted around half of my applications, and I realized that in the educational institutions section, some of the apps have the option to list high school information (although some don't). In the applications I've submitted so far, unless there was a specific section on the application for it, I've only listed my undergraduate institution. I'm wondering if this is something that might affect the application, or whether it's something that schools are very unlikely to care about. Any information would be very helpful. Thanks!

doesnt matter

You can list it if you want. I think Columbia actually required you to list it for some reason. Probably a mistake made by those at CLS determining which components of the application to require. It might carry over into your other applications once you've entered the information, but it's not a big deal.