Before you get acccepted to a college there are a few things that you have to have completed. A lot of colleges will ask you things like have you taken your FAFSA? do you have the right exta-ciricular activities? have you taken the right classes? do you have the right GPA? All of these things will come up in any applications for college. Here is some examples of what some colleges expect you to have done.

Harvard:

four years of English, with extensive practice in writing; four years of math; four years of science: biology, chemistry, physics, and an advanced course in one of these subjects; three years of history, including American and European history; and four years of one foreign language.

Yale:

Must complete 36 courses in 8 semesters
• Must complete the requirements of the major(s), including a senior essay or project
• Students are required to take at least two courses each in the humanities, social sciences, and natural sciences and to demonstrate proficiency in quantitative reasoning, foreign language, and writing by completing designated courses in those areas.
• 2,000 courses in over 70 majors
• Aproximately 14% have double majors
• Directed Studies: a selective freshman program in the humanities that introduces students to the fundamental works and ideas of Western culture through several intellectual disciplines
• Perspectives on Science: a lecture and discussion course for those freshmen who have unusually strong backgrounds in science and mathematics with a summer research option
• Undergraduate research opportunities through individual faculty sponsored research projects in the departments, fellowships, travel grants, and interdepartmental research programs
• Joint B.A./M.A. programs: students of exceptional ability may undertake graduate work that will qualify them for the simultaneous award of the bachelor's and master's degrees at the end of their senior year
• Special Divisional Majors: for students who want to design a major to suit their specific academic interests
• Study Abroad: programs that enable a student to earn a full term or year of credit toward the bachelor's degree
• Residential College Seminars on topics that fall outside the departmental curricula

These are two of the hardest universities in the US. So if you think that you need to have all of this you dont. Not unless you are going for a big university. Community colleges are a lot simpler when it comes to requirements.