It may be that I'm misinterpreting the intention behind the "Education" part of my Careers profile, but I'd like to be able to include education that I've received that didn't have a major or minor associated, since I'm currently a high school student and thus haven't been through higher education.
The Education section is to list any educational qualifications you've earned. It doesn't need to be a degree, so you don't need to specify "major" or "minor" if that's not how what you're studying is structured. It's a free text field so you can type what you want.
If you've earned some kind of relevant high school qualification (say, a diploma or GCSE), you can list it here. If you're working towards one, just add "[in progress]" at the end.