Such as Algebra through Trigonometry, Language classes like English, unless you want to learn a new language.
Science does not fall under this category, because it is necessary, otherwise we wouldn't know that certain elements react differently, and possibly dangerously with other elements.
World Cultures is somewhat important, so that you understand other people in the world better.
Mrs. Smith: "Yes, what is it John?"
John: "This is Useless Information, when will we ever need to know how to find the x and y intercepts of the graphed line?"
Mrs. Smith thinking: "Must change the subject..."
Mrs. Smith: "Well John, if you ever get a job including the use of advanced mathematics, you will need to learn this."
John: "But I hate math, I want to be a race car driver."
Mrs. Smith: "SHUT UP NO BACK TALKING, NOW GO TO THE PRINCIPAL'S OFFICE RIGHT NOW!!!!"
John: "F*** YOU!"
After John graduated High School, he became a successful Nascar driver and later visited Mrs. Smith to rub it in, and to show her that math isn't necessary to drive a car really fast.