Wäre sehr nett wenn mir jemand das Korrektur lesen könnte, ich bin nicht so gut in Englisch.
In the USA the students changed after Elementary school to middle school wich is also known as junior high school .
After that, they attend the actual high school , which is also called senior high school or senior high.
The construction of schools is diffrent from school district to school district . In some states the students have to go to high school until they are 18. The traditional construction for high schools is from 9th to 12th grade. In other states they are allowed to leaving school at the age of 16 or 17, if the parents agree. In senior high school, the classes are not only marked with numbers, but the students of the individual classes also have special names, for example the 9th graders are called "freshmen". The 10th graders are called "sophomore", the students from the 11th grade are "juniors" and the 12th graders are called "seniors". The same titles are also used in colleges and universities .