actually algebral I(代数一) is in the 小学 math books

they give to your kid. I found this when my son was 2nd grade. And it is also in all 小学数学 books. they introduce gradually and getting hard every year. teacher also tought kids all those, but any a few can understand. my son and his classmate take sat in 6th grade to decide which level class they should be. I never tought my son anything and just required him to study school books. he finished geometry(几何)in 8th grade. he didn't need take calculus I and directly took calculus II. now he is in advance topic class.