Well, it depends on what state you're in but most kids in the United States start school at about six when they go to elementary school and that goes from the first grade up to the sixth grade. Some kids go to a kindergarten the year before that. Then they go on to junior high school, that's about eleven, and that's the seventh, eighth and ninth grades. And then they go on to senior high school around age fourteen starting in the tenth grade and finishing in the twelfth grade usually. Some students will leave school at sixteen and they'll start work, but most of them stay on to graduate from high school at age eighteen. In the first year at high school or college students are called "freshmen", in the second they're called "sophomores", in the third year we call them "juniors" and in the fourth year they're called "seniors". Now a lot of high school graduates then go to college or university and they do a four-year first degree course. Some of them might go to junior college which is a two-year course.