School systems are organized structures that provide education to students. They typically include various levels, such as elementary school, middle school, and high school, each designed to cater to different age groups and learning needs. These systems can be public, funded by the government, or private, funded through tuition and donations. In many countries, school systems follow a standardized curriculum that outlines what students should learn at each grade level. This curriculum often includes subjects like math, science, language arts, and social studies. School systems aim to prepare students for future academic pursuits and life skills.