Education in the United States is mainly provided by the public sector, with control and funding coming from three levels: Federal, State, and Local.
   School attendance is mandatory and nearly universal at the primary and secondary levels. At these levels, school curricula, funding, teaching, and other policies are set through locally elected school boards with jurisdiction over school districts. School districts are usually separate from other local jurisdictions, with independent officials and budgets. Educational standards and standardized testing decisions are usually made by state governments.
Ages For Compulsory Education: The ages for compulsory education vary by state, beginning at ages five to eight and ending at the ages of fourteen to eighteen. A growing number of states are now requiring school attendance until the age of 18.
Compulsory education Requirements: Compulsory education requirements can generally be satisfied by attending public schools, state-certified private schools, or an approved home school program. In most public and private schools, education is divided into three levels: elementary school, junior high school (often called middle school), and high school (sometimes referred to as secondary education). In almost all schools at these levels, children are divided by age groups into grades, ranging from kindergarten (followed by first grade) for the youngest children in elementary school, up to twelfth grade, which is the final year of high school. The exact age range of students in these grade levels varies slightly from area to area.
Post-Secondary Education: Post-Secondary Education, better known as "college" in the United States, is generally governed separately from the elementary and high school system, and is described in a separate section below.
In the year 2000, there were 76.6 million students enrolled in schools from kindergarten through graduate schools. Of these, 72 percent aged 12 to 17 were judged academically "on track" for their age (enrolled in school at or above grade level). Of those enrolled in compulsory education, 5.2 million (10.4 percent) were attending private schools. Among the country's adult population, over 85 percent have completed high school and 27 percent have received a bachelor's degree or higher. The average salary for college or university graduates is greater than $51,000, exceeding the national average of those without a high school diploma by more than $23,000, according to a 2005 study by the U.S. Census Bureau. The United States school system includes over 5,000 Montessori schools.
The country has a reading literacy rate at 98% of the population over age 15, while ranking below average in science and mathematics understanding compared to other developed countries. In 2008, there was a 77% graduation rate from high school, below that of most developed countries.
The poor performance has pushed public and private efforts such as the No Child Left Behind Act. In addition, the ratio of college-educated adults entering the workforce to general population (33%) is slightly below the mean of other developed countries (35%) and rate of participation of the labor force in continuing education is high. A 2000s study by Jon Miller of Michigan State University concluded that "A slightly higher proportion of American adults qualify as scientifically literate than European or Japanese adults".                                      
                            Reference: http://en.wikipedia.org/wiki/Education_in_the_United_States