Education about Chian

In my country everyone must be start primary school e.g 6 or 7 and not less than 6 years of age. They finished primary school in 12 or 13 years old. And finished secondary school in 18 or 19 years old. In China is not all children study in secondary school, because e.g 6 to 16 is compulsory education. It's mean primary school and junior high school is compulsory education. I think in this age bracket is good for children to learning knowledge. Many people think higher education can help they know more about knowledge and find job more easily, so they finished compulsory education and go on to higher education like secondary school、university. If people want go on to higher education they have to pay money by themselves.
In my country exams and continuous assessment more common, especially in secondary school. Every week we have exams and everyday have a lot of homework. In secondary school no one is feel not very tired. I think exams is the better way of monitoring progress, because exam is finished at class, it don't check book and discuss with classmate. This is by yourself and can correct know student's performance and easy find which knowledge is the bad, which is ok.