No, high school and elementary school are two different levels of education. High school teaches kS3 and higher levels of education, whilst elementary schools teach from KS2 upwards. :)
Middle school is separate from elementary and high school because middle school student's fit into neither category. Middle school student's are more mature than elementary school students, and at a...
Secondary school is the progression from primary school. It is or it should be more rigorous and challenging of your intellect as you continue to develop into an adult.