In the United States, students begin higher education after completing 12 years of primary and secondary education. Higher education is available in public and private institutions, institutions affiliated with religious groups, and profit-making institutions a wide variety.
Size varies, too.
The United States has no central system of Higher education. Institutions vary in significant ways. You might be surprised at the amount of freedom you have in selecting your courses and your program of study. Because you want to make the right decisions about your educational goals, this freedom can be stressful. Take an easy or moderate course load during your first term.