How to apply for Twitter, Google, etc...?

[Eva]

Hi, I am currently not in school at the moment but I am working as a receptionist. But I would love to work for the big named companies such as Twitter, Google, Apple, etc.. I honestly do not want to waste my time in community college going through the same courses I've met in highschool, but I want to get hands down experience that works in the field Im looking for. Are there any schools or courses that will teach me things I would need to know in order to apply to those companies? I know it sounds so far out. I'm also from the Bay Area, so these companies are actually pretty close to me. I just want to know what I could major in? Thanks