Quarters instead of semesters have been done to great success: https://www.wpi.edu/sites/default/files/2019/03/21/UG_2019-2...
This is a fun idea. It's well known that the reasoning for summer vacations was to allow the student to help out on a family farm, and yet most students (especially at younger ages) waste this time. At least in college students take internships, but it would be interesting to promote more co-ops or adjusting the schedule of coursework.
I was at Ohio State when they switched from quarters to semesters. Dumbest experience of my life. Lost all faith in higher education.
Victoria University in Australia has moved to a block model, where students do 1 course at a time, in 4 weeks. Sit the exam/assessment and then move onto the next. They do 8 courses a year (Standard Full time Australian study load)