In elementary school we observe the development of the student in the fundamental subjects of math, reading, social studies, art, music, and science.
In middle school we start to broaden the spectrum of learning into more critical and logical based operations. We broaden and enhance the skills acquired from elementary school.
In High School we have start to expand the knowledge from critical to complex adding in operations that would need more than just a formula to solve. High school is the time for you to grasp on the education you like to direct the path to university.