No its a huge waste of students time. It should 1 or 2 days a week at most with heaps of camping, socialising, projects, drama, jam sessions, agriculture, handyman stuff, driving knowledge, all the arts, making things, getting street smart etc.... Schools move a terrible slow pace for most kids , schools are run by teachers whose priority is to keep their jobs and keep kids in the dark. This is why home schooling is booming as well as alternative schools. Its also why online learning, and private education is about to take off. I estimate most students I have taught can learn 5 times faster than what a school goes at.
Elementary School teaches the basics, Middle School prepares you for High School, High School prepares you for college, and college prepares you for your career. So technically all of school is important and builds up on each other.