There are special classes that student have to take. Four of the most important are Science, Math, Steam, and History.
History is a class for learning the past, important past. Like the topic of America, how it started and when is all History.
The first school was in Boston US. in 1821. Close to 19th centry public schools were all over.
Steam is a mix of Science, Math, Technology, Engineer, and Arts
https://oneclass.com/blog/san-diego-state-university/49074-5-lower-division-history-classes-at-sdsu.en.html
https://www.thoughtco.com/private-vs-public-schools-2773334
Math is numbers and algebra, students learn how to divide, subtract, multiply, and add.
Science is the study of structure and behavior
http://jewel92.com/ontario-elementary-students-to-get-at-least-one-hour-of-math-everyday/
http://www.pngmart.com/image/tag/science