USA Education Advice

1.1.General Information
The American education system is unlike that in many other countries. Education is primarily the responsibility of state and local government, and so there is little standardization in the curriculum, for example. The individual states have great control over what is taught in their schools and over the requirements that a student must meet, and they are also responsible for the funding of schooling. Therefore, there is huge variation regarding courses, subjects, and other activities – it always depends on where the school is located. Still, there are some common points, as e.g. the division of the education system into three levels: elementary/primary education, secondary education, and postsecondary/higher education (college or university).
The following chart can be found at:
Formal schooling lasts 12 years, until around age 18. Compulsory schooling, though, ends by age 16 in most states; the remaining states require students to attend school until they are 17 or 18. All children in the United States have access to free public schools. Private schools (religious and non-sectarian) are available, but students must pay tuition to attend them.
In the following description of the U.S. education structure, we will focus only on the first two levels: primary and secondary schools.
In high school, students in their first year are called freshman, in their second year sophomore, in their third year junior, and in their last and fourth year senior.

There is an even greater variety of subjects than before. Students must earn a certain number of  credits (which they get for a successfully completed course) in order to graduate and be awarded with a High School Diploma – there is no final examination like in many other countries.

The number and combination of classes necessary depend on the school district and on the kind of diploma desired. The following two links are examples of different high school graduation requirements (North Carolina, South Carolina):
Only with a high school diploma students can enroll in postsecondary education. It is important to know that colleges and universities sometimes require certain high school credits or tests (e.g. SAT) for admission, and students must plan their high school career with those requirements in mind.